Firefox¶
Original author: Tommy Nguyen
Last modified: Mon Aug 1 17:02
arkenfox/user.js¶
The recommended way of managing config settings nowadays is arkenfox. Help can be found in the wiki.
For historical purposes, advice on individual settings can be found below. Note however that these settings may be deprecated or inactive in the future.
Disable automatic redirect to a website if typing an invalid URL¶
Example, you type firefox build/html/fedora/gcc.rst
(where gcc.rst doesn’t exist) and it opens up build.com/...
. Go to about:config
and set browser.fixup.alternate.enabled
to false
.
Glitchy UI when using custom GTK theme¶
If you are using a custom GTK theme for your window manager, you need to instruct Firefox to use the default theme. On XFCE, this will be something like:
env GTK_THEME=Adwaita:light firefox
If that’s inconvenient, you can add the change to Firefox directly. Go to about:config
and add a new key called widget.content.gtk-theme-override
. Set the value to Adwaita:light
or whatever you prefer.
Forcing dark theme¶
By default, Firefox will use your system preference to determine whether or not
to use a dark theme, but does not expose this option. In about:config
,
create a new entry called ui.systemUsesDarkTheme
and set it to 1
.
If you experience a “flashing” white background when loading a new tab, then
you need a custom userContent.css
file. First, enable
toolkit.legacyUserProfileCustomizations.stylesheets
. Then create a
chrome
folder in your user profile and populate userContent.css
with
the following contents:
/*
dark background in new tabs without a white flash (with tridactyl newtab)
@see: https://github.com/tridactyl/tridactyl/issues/2510
*/
:root {
--tridactyl-bg: #1d1b19 !important;
--tridactyl-fg: white !important;
}
/*
set the background color of the new tab page (without tridactyl or with tridactyl without newtab)
*/
@-moz-document url-prefix(about:home), url-prefix(about:newtab) {
body {
background: #1d1b19;
}
}
/*
if you set it straight to body element, it will be applied to the random web pages
that don't explicitly set the background color of their body element
(there's many of those online)
*/
/* body { */
/* background-color: #1d1b19; */
/* } */
Credit goes to @maricn for the CSS.
Disable network.http.referer.spoofSource
¶
Some privacy guides or tools suggest you enable this setting. However, it can
break websites. This article
suggests using setting network.http.referer.XOriginPolicy
and
network.http.referer.XOriginTrimmingPolicy
to 2
instead.
Minimizing ram usage¶
Firefox uses multiple processes for tabs which can lead to increased RAM usage
over time. While you can go to about:memory
and run the garbage collector,
it has a marginal effect. Restarting the browser is needed to keep RAM usage
down. However, there are two things you can do to mitigate high RAM usage:
in
about:config
, setbrowser.newtab.preload
to false. This will prevent tabs from loading until you click on themInstall Auto Tab Discard which will put tabs to sleep automatically if not in use
Alternative to Stylus¶
If you wish not to have Stylus installed but want to replicate its functionality, here’s what you can do. First, go to each style you have installed and export it. It will look something like:
@-moz-document domain("example.com") {
/* insert style here */
}
You can use url-prefix
, etc. Put it in a folder somewhere. We want to now
append this to userContent.css
which is going to be located in the
chrome
folder in your Firefox profile.
for file in *.css
do
cat "$file" >> $HOME/.mozilla/firefox/some-profile.default/chrome/userContent.css
done