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Firefox "about:config" Flags That I Like 🔥🦊

Published at

7/17/2024

Hardware Video Acceleration for Linux

Option	Value
`gfx.webrender.all`	true
`gl.require-hardware`	true
`layers.acceleration.force-enabled`	true
`media.av1.enabled`	false
`media.ffmpeg.vaapi.enabled`	true
`media.hardware-video-decoding.enabled`	true
`media.hardware-video-decoding.force-enabled`	true
`media.rdd-ffmpeg.enabled`	true
`media.rdd-ffvpx.enabled`	true
`media.rdd-vpx.enabled`	false
`media.utility-ffmpeg.enabled`	true
`widget.wayland-dmabuf-vaapi.enabled`	true

The following is specifically for Nvidia Machines using libva-nvidia-driver (from elFarto/nvidia-vaapi-driver)

Option	Value	Reason
`gfx.x11-egl.force-enabled`	true	Required, this driver requires that Firefox use the EGL backend. It may be enabled by default. It is recommended to test it with the `MOZ_X11_EGL=1` environment variable before enabling it in the Firefox configuration.
`widget.dmabuf.force-enabled`	true	Required on NVIDIA 470 series drivers, and currently REQUIRED on 500+ drivers due to a Firefox change. Note that Firefox isn't coded to allow DMA-BUF support without GBM support, so it may not function completely correctly when it's forced on.

Compact Mode Interface

Option	Value
`browser.compactmode.show`	true

Faster Content Painting

I prefer web pages to "paint" as early as it can, even if I am going to see some page breakage initially. I don't recommend this if you like good UX.

Option	Value	Comment
`content.notify.backoffcount`	5	This can be kept at the default value (`-1`), but I've just always had it at `5`
`nglayout.initialpaint.delay_in_oopif`	0
`nglayout.initialpaint.delay`	0

Firefox 130+ Disable Tab Hover Behaviour

Option	Value
`browser.tabs.hoverPreview.enabled`	false
`browser.tabs.hoverPreview.showThumbnails`	false

Force System Emoji Font on Linux 🙂🐧

Option	Value	Comment
`font.name-list.emoji`	emoji	default value is Twemoji Mozilla (if things break for some reason)
`gfx.font_rendering.fontconfig.max_generic_substitutions`	127
`gfx.font_rendering.opentype_svg.enabled`	false

These flags disable the usage of the built-in Twemoji Mozilla Emoji font.

(workaround retrieved from Archwiki - Firefox#Font troubleshooting)

Linux Mouse Cursor Compatibility

Option	Value
`widget.gtk.legacy-cursors.enabled`	true

this flag enables the utilization of all legacy/fallback xcursors on Linux, which is useful on a very minimal Linux install that doesn't have the adwaita-cursor-theme installed.

(enabling this flag does not affect the default behaviour, if you **do* have an xcursor theme installed)*

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