247 lines
9.2 KiB
Markdown
247 lines
9.2 KiB
Markdown
# Preference
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<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
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**Table of Contents**
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- [Basics](#basics)
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- [Default Config](#default-config)
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- [User Config](#user-config)
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* [about:config](#aboutconfig)
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* [prefs.js](#prefsjs)
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* [user.js](#userjs)
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- [Auto Config](#auto-config)
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- [Using with User Custom CSS](#using-with-user-custom-css)
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- [Sync](#sync)
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- [Related Source file](#related-source-file)
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<!-- markdown-toc end -->
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## Basics
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**Related Docs**
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- [Firefox Source Docs: libpref](https://firefox-source-docs.mozilla.org/modules/libpref/index.html)
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**Key/Value**
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- Key:
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- Pref name
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- Type: 8-bit string
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- Convention is to use a dotted segmented form (Ex. `browser.cache.disk.enable`)
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- Value:
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- Type: bool, 32-bit ints, 8-bit C string
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- When you need an float, use a string. (Ex. `general.smoothScroll.currentVelocityWeighting`: `"0.25"`)
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**Main Purpose**
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- Feature enable/disable flags (Ex. `xpinstall.signatures.required`).
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- User preferences (Ex. things set from `about:preferences`)
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- Internal application parameters (Ex. `javascript.options.mem.nursery.max_kb`).
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- Application data (Ex. `browser.onboarding.tour.onboarding-tour-addons.completed`, `services.sync.clients.lastSync`).
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- Things that might need locking in an enterprise installation.
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**Preference file RFC**
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Key information on the sets that can be used in the configuration file.
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- `pref()`: Set default pref
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- `sticky` attr: same as `sticky_pref()`
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- `locked` attr: cannot change from default.
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- `sticky_pref()`: Always logged even if the defaults match
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- `user_pref()`: Set user pref
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The following is a method of operating the configuration file parser.
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See [EBNF(Extended Backus-Naur form)](https://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_form) if you want to know about syntax.
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```ebnf
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<pref-file> = <pref>*
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<pref> = <pref-spec> "(" <pref-name> "," <pref-value> <pref-attrs> ")" ";"
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<pref-spec> = "user_pref" | "pref" | "sticky_pref" // in default pref files
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<pref-spec> = "user_pref" // in user pref files
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<pref-name> = <string-literal>
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<pref-value> = <string-literal> | "true" | "false" | <int-value>
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<int-value> = <sign>? <int-literal>
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<sign> = "+" | "-"
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<int-literal> = [0-9]+ (and cannot be followed by [A-Za-z_])
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<string-literal> =
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A single or double-quoted string, with the following escape sequences
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allowed: \", \', \\, \n, \r, \xNN, \uNNNN, where \xNN gives a raw byte
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value that is copied directly into an 8-bit string value, and \uNNNN
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gives a UTF-16 code unit that is converted to UTF-8 before being copied
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into an 8-bit string value. \x00 and \u0000 are disallowed because they
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would cause C++ code handling such strings to misbehave.
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<pref-attrs> = ("," <pref-attr>)* // in default pref files
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= <empty> // in user pref files
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<pref-attr> = "sticky" | "locked" // default pref files only
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```
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## Default Config
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- [`modules/libpref/init/all.js`](https://github.com/mozilla/gecko-dev/blob/master/modules/libpref/init/all.js): all products
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- [`browser/app/profile/firefox.js`](https://github.com/mozilla/gecko-dev/blob/master/browser/app/profile/firefox.js): only firefox deskstop
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In release builds these are all put into [`omni.ja`](./Omni_ja.md).
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## User Config
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**Related Docs**
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- [mozillaZine: Editing configuration](https://kb.mozillazine.org/Editing_configuration)
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- [Support Mozilla: How to fix preferences that won't save](https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save)
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- [Support Mozilla: Reset Firefox preferences to troubleshoot and fix problems](https://support.mozilla.org/en-US/kb/reset-preferences-fix-problems)
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- [UDN: A brief guide to Mozilla preferences](https://udn.realityripple.com/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences)
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**Restrictions**
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It can be defined using only `user_pref()`.
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> User pref file syntax is slightly more restrictive than default pref file syntax. In user pref files `user_pref` definitions are allowed but `pref` and `sticky_pref` definitions are not, and attributes (such as `locked`) are not allowed.
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**File Path**
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`prefs.js`, `user.js` is located in the profile directory.
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### about:config
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It is written to `prefs.js` in a way that can be set by the GUI.
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- [Support Mozilla: Configuration Editor for Firefox](https://support.mozilla.org/en-US/kb/about-config-editor-firefox)
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### prefs.js
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**Related Docs**
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- [mozillaZine: Prefs.js file](https://kb.mozillazine.org/Prefs.js_file)
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**Basics**
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It exists in the profile directory, and is used to store settings that are changed from *defaults* or when users added *new settings*.
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In general, Do NOT edit `prefs.js` directly.
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### user.js
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**Related Docs**
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- [mozillaZine: User.js file](https://kb.mozillazine.org/User.js_file)
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**Restrictions**
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A `user.js` file can make certain preference settings more or less "permanent" in a specific profile.
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Once an entry for a preference setting exists in the `user.js` file, any change you make to that setting in the options and preference dialogs or via `about:config` will be lost when you restart your firefox because the `user.js` entry will override it.
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You'll have to first delete or edit the `user.js` file to remove the entries before the preferences can be changed in the application.
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**Example**
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```javascript
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// user.js
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user_pref("browser.cache.disk.enable", false); // Bool
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user_pref("layout.css.prefers-color-scheme.content-override", 3); // Int
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user_pref("general.smoothScroll.currentVelocityWeighting", "0.12"); // String
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```
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## Auto Config
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**Related Docs**
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- [Support Mozilla: Customizing Firefox Using AutoConfig](https://support.mozilla.org/en-US/kb/customizing-firefox-using-autoconfig)
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- [What is Autoconfig Startup Scripting (AKA userChrome.js)?](https://www.userchrome.org/what-is-userchrome-js.html)
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- [UDN: Gecko Chrome](https://udn.realityripple.com/docs/Mozilla/Gecko/Chrome)
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- [UDN: JavaScript code modules](https://udn.realityripple.com/docs/Mozilla/JavaScript_code_modules)
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- [UDN: Limitations of chrome scripts](https://udn.realityripple.com/docs/Mozilla/Firefox/Multiprocess_Leftovers/Limitations_of_chrome_scripts)
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**Basics**
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Customizations that cannot be done with add-on and [`User Custom CSS`](./README.md#user-custom-css), such as adding browser UI elements directly or changing default behavior, must use `Auto Config`.
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**How to**
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```javascript
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pref("general.config.filename", "config.js"); // alternative to "firefox.cfg", for using highlight
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pref("general.config.obscure_value", 0);
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```
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**Example**
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```javascript
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pref("general.config.filename", "config.js"); // alternative to "firefox.cfg", for using highlight
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pref("general.config.obscure_value", 0);
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```
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## Using with User Custom CSS
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**Related Docs**
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- [MDN: @supports](https://developer.mozilla.org/en-US/docs/Web/CSS/@supports)
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- [UDN: `CSS -moz-bool-pref() @supports function`](https://udn.realityripple.com/docs/Mozilla/Gecko/Chrome/CSS/-moz-bool-pref)
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**Restrictions**
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Please refer to [Doc: Restrictions.md](./Restrictions.md#supports)'s `@support`.
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**Example**
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Test each case by turning on/off the following settings.
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- `userChrome.navBar.red`
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- `userChrome.navBar.margin`
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```css
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/* userChrome.css */
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/* 1. If config is true */
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@supports -moz-bool-pref("userChrome.navBar.red") {
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#nav-bar {
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background-color: red !important;
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}
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}
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/* 2. When any one of the config is true */
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@supports -moz-bool-pref("userChrome.navBar.red") or -moz-bool-pref("userChrome.navBar.margin") {
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#nav-bar {
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background-color: red !important;
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margin-block: 20px;
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}
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}
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/* 3. Multiple configs must all be satisfied */
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@supports -moz-bool-pref("userChrome.navBar.red") and -moz-bool-pref("userChrome.navBar.margin") {
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#nav-bar {
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background-color: red !important;
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margin-block: 20px;
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}
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}
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/* 4. 3's Other version */
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@supports -moz-bool-pref("userChrome.navBar.red") {
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@supports -moz-bool-pref("userChrome.navBar.margin") {
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#nav-bar {
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background-color: red !important;
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margin-block: 20px;
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}
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}
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}
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/* 5. If not exist or false */
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@supports not -moz-bool-pref("userChrome.navBar.red") {
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#nav-bar {
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background-color: blue !important;
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}
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}
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```
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## Sync
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**Related Docs**
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- [Support Mozilla: Sync custom preferences](https://support.mozilla.org/en-US/kb/sync-custom-preferences)
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**How to**
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Firefox Sync allows you to [choose the types of data](https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox) to sync across all devices.
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The following options are required to sync custom configs.
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- `services.sync.prefs.dangerously_allow_arbitrary` to `true`
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Then, subsequently any pref can be pushed there by creating a remote with prefix.
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- `services.sync.prefs.sync.`
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**Example**
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```javascript
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// user.js
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user_pref("services.sync.prefs.dangerously_allow_arbitrary", true); // Must need
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// Sync UI
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user_pref("services.sync.prefs.sync.browser.uiCustomization.state", true);
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user_pref("services.sync.prefs.sync.browser.uidensity", true);
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```
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## Related Source file
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- https://github.com/mozilla/gecko-dev/blob/master/modules/libpref/parser/src/lib.rs
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- https://github.com/mozilla/gecko-dev/blob/master/extensions/pref/autoconfig/src/prefcalls.js
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