Advanced Firefox configuration and tips

This note was created on 2023-03-20
This note was last edited on 2023-07-27

=== Wayland ===
Add the following variable to "~/.profile":
~~~
MOZ_ENABLE_WAYLAND=1
~~~

=== user.js ===
My "user.js": https://codeberg.org/pashynskykh/firefox-userjs
In order to install, "user.js" should be placed in the root of Firefox profile (visit "about:profiles" to find location of your profile).

=== Hardware acceleration ===
1. Install required driver(s):
   - for Intel: intel-media-va-driver-non-free
   - for Nvidia: mesa-va-drivers nvidia-vdpau-driver
2. Change the following settings in "about:config":
   ~~~
   media.ffmpeg.vaapi.enabled:true
   media.ffvpx.enabled:false
   media.rdd-vpx.enabled:false
   media.navigator.mediadatadecoder_vpx_enabled:true
   ~~~
3. To check, open any video on YouTube and execute the following command:
   # intel_gpu_top
   Note: "intel_gpu_top" is provided by "intel-gpu-tools" package.

=== Disable VP9 and AV1 codecs ===
This may be needed to enable hardware acceleration.
~~~
media.mediasource.vp9.enabled=false
media.av1.enabled=false
~~~

=== Disable AVIF to make images load faster on hardware w/o its support ===
~~~
image.avif.enabled=false
~~~

=== In-memory cache ===
1. Clean all disk cache entirely.
2. Make the following changes in "about:config":
   ~~~
   browser.cache.disk.enable:false
   browser.cache.disk.smart_size.enabled:false
   browser.cache.disk_cache_ssl:false
   browser.cache.offline.enable:false
   browser.cache.memory.enable:true
   browser.cache.memory.capacity:512000
   browser.privatebrowsing.forceMediaMemoryCache:true
   ~~~
   Note: The number 512000 is in kilobytes.
3. Restart Firefox.
4. Changes could be checked by visiting "about:cache".

=== Cleanup Firefox databases ===
$ find ~/.mozilla/firefox/ -type f -name "*.sqlite" -exec sqlite3 {} VACUUM \;

=== Disable theme sync ===
Set "services.sync.prefs.sync.extensions.activeThemeID" to "false".

=== Enable ECH and HTTP/3 ===
~~~
network.dns.echconfig.enabled=true
network.dns.http3.echconfig.enabled=true
network.trr.mode=3
~~~
Check:
1. https://www.cloudflare.com/ssl/encrypted-sni/
2. https://cloudflare-quic.com/

If there will be issues with connection to some sites:
~~~
network.http.http3.version_negotiation.enabled=true
~~~

=== Do not close window after closing last tab ===
Set "browser.tabs.closeWindowWithLastTab" to "false".