Usage

First, before you can use these extensions, you need a browser that is built with MOZ_REQUIRE_SIGNING="".

Here is a non-exhaustive list of these:

• Librewolf
• Firefox Developer Edition
• Firefox Nightly
• Zen Browser
• Glide
• Many other Firefox forks.

Then set xpinstall.signatures.required to false in either user.js or about:config.

Installation

Once you have a browser that supports unsigned extensions, follow the instructions for your platform.

Nix (with flakes and home-manager)

First, add the github:firefox-extensions-declarative/firefox-extensions-declarative flake to your flake inputs.
Now, you can use the extensions in you home-manager configuration like so:

# Example with surfingkeys-declarative
{
  programs.firefox.profiles.nix = {
    extensions.packages = [
      inputs.firefox-extensions-declarative.packages.${pkgs.stdenv.hostPlatform.system}.surfingkeys-declarative
    ];
  };
  programs.firefox.policies = {
    "3rdparty".Extensions."surfingkeys@brookhong.github.io" = {
      showAdvanced = true;
      snippets = builtins.readFile ./surfingkeys.js;
    };
  };
}

Build from source

Clone the extension you want to install and follow the build instructions in its reference.

To install an XPI, go to about:addons, click the button to the side of “Manage Your Extensions”, and click “Install from file”.