librewolf: Add invidious extension

Note that to significantly improve video quality DASH can be enabled in
the settings. This may become the default in the future.

home/librewolf.nix

@@ -25,6 +25,7 @@ in
         redlib
         new-tab-identity
         showdex
+        invidious
       ];
 
       search = {

packages/invidious.nix

@@ -0,0 +1,33 @@
+{
+  lib,
+  stdenvNoCC,
+  fetchurl,
+}:
+
+stdenvNoCC.mkDerivation (finalAttrs: {
+  pname = "invidious";
+  version = "2.0.0";
+
+  src = fetchurl {
+    url = "https://addons.mozilla.org/firefox/downloads/file/3661232/invidious_site-${finalAttrs.version}.xpi";
+    hash = "sha256-xSyVIz5uqdUoaW+IacG6+VpgBzPUBbpOoXx2x6OrPBQ=";
+  };
+
+  dontUnpack = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm644 "$src" "$out/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/{0d069122-737b-44f3-8309-80020b0d0c70}.xpi"
+
+    runHook postInstall
+  '';
+
+  meta = {
+    homepage = "https://addons.mozilla.org/en-US/firefox/addon/invidious-site/";
+    description = "Redirect YouTube links to Invidious";
+    license = lib.licenses.mpl20;
+    maintainers = with lib.maintainers; [ donovanglover ];
+    platforms = lib.platforms.all;
+  };
+})