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firefox-addons

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UpdatedJuly 2, 2026 at 09:55

Use this skill when the user needs to manage Firefox extensions declaratively — add, update, or audit version-pinned, hash-locked XPI derivations. Applies when working on browser extensions, even if the user doesn't say "firefox-addons" or "XPI".

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BastianAsmussen

BastianAsmussen/dotfiles

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Software DevelopersComputer and Mathematical Occupations·SOC 15-1252

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SKILL.md

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name	firefox-addons
description	Use this skill when the user needs to manage Firefox extensions declaratively — add, update, or audit version-pinned, hash-locked XPI derivations. Applies when working on browser extensions, even if the user doesn't say "firefox-addons" or "XPI".
metadata	{"input_rev":"6c2dd39e5bf2666b298ee3bdbf0dfd858911e8e3","input_hash":"sha256-YV++7tX9MN8Y1APD3BsXqLioBeKZjgFPxrT0YoD416A=","when_to_use":"firefox-addons, Firefox extensions, XPI derivations, extension SRI hashes"}

Pin check

grep -A4 '"firefox-addons"' flake.lock | grep narHash Expected: sha256-YV++7tX9MN8Y1APD3BsXqLioBeKZjgFPxrT0YoD416A= If different, update metadata.input_hash and metadata.input_rev.

Action

Reference an extension at pkgs.firefox-addons.<name> — available anywhere the overlay is applied.
Install extensions via schizofox's extraExtensions in modules/homeManagerModules/firefox.nix:41-49.
To update all addons: nix flake update firefox-addons.

Gotchas

The overlay at modules/overlays.nix:28-29 applies system-wide, but extensions only take effect when referenced in schizofox's extraExtensions list. Just adding the overlay does nothing visible.
Standalone home-manager configs need the overlay separately at modules/home-configurations.nix:20.

Verification

nix eval .#legacyPackages.x86_64-linux.firefox-addons.gopass-bridge.name

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name	firefox-addons
description	Use this skill when the user needs to manage Firefox extensions declaratively — add, update, or audit version-pinned, hash-locked XPI derivations. Applies when working on browser extensions, even if the user doesn't say "firefox-addons" or "XPI".
metadata	{"input_rev":"6c2dd39e5bf2666b298ee3bdbf0dfd858911e8e3","input_hash":"sha256-YV++7tX9MN8Y1APD3BsXqLioBeKZjgFPxrT0YoD416A=","when_to_use":"firefox-addons, Firefox extensions, XPI derivations, extension SRI hashes"}

Pin check

grep -A4 '"firefox-addons"' flake.lock | grep narHash Expected: sha256-YV++7tX9MN8Y1APD3BsXqLioBeKZjgFPxrT0YoD416A= If different, update metadata.input_hash and metadata.input_rev.

Action

Reference an extension at pkgs.firefox-addons.<name> — available anywhere the overlay is applied.
Install extensions via schizofox's extraExtensions in modules/homeManagerModules/firefox.nix:41-49.
To update all addons: nix flake update firefox-addons.

Gotchas

The overlay at modules/overlays.nix:28-29 applies system-wide, but extensions only take effect when referenced in schizofox's extraExtensions list. Just adding the overlay does nothing visible.
Standalone home-manager configs need the overlay separately at modules/home-configurations.nix:20.

Verification

nix eval .#legacyPackages.x86_64-linux.firefox-addons.gopass-bridge.name