Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: firefox-unwrapped 0 -> 1
attrpath: firefox-unwrapped
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] these 2 derivations will be built:
  /nix/store/8nzvzfzifd8bmsw89lz20fb4a0vmr3z6-update-firefox-unwrapped.drv
  /nix/store/83lv6x3zh67h7r5sva1x1m9z47ki0c8v-packages.json.drv
this path will be fetched (0.85 MiB download, 3.22 MiB unpacked):
  /nix/store/zl4vpd47mk2zvy5ljxjxx2ma99gimby0-xidel-unstable-2022-11-01
copying path '/nix/store/zl4vpd47mk2zvy5ljxjxx2ma99gimby0-xidel-unstable-2022-11-01' from 'https://cache.nixos.org'...
building '/nix/store/8nzvzfzifd8bmsw89lz20fb4a0vmr3z6-update-firefox-unwrapped.drv'...
building '/nix/store/83lv6x3zh67h7r5sva1x1m9z47ki0c8v-packages.json.drv'...

Going to be running update for following packages:
 - firefox-unwrapped-149.0

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - firefox-unwrapped-149.0: UPDATING ...
 - firefox-unwrapped-149.0: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
index 3fd45023ffa3..c15ef79b06a9 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox.nix
@@ -9,10 +9,10 @@
 
 buildMozillaMach rec {
   pname = "firefox";
-  version = "149.0";
+  version = "149.0.2";
   src = fetchurl {
     url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "cdd871a7738fb70d85a703e89c4874d1bf44184b4c9b28901902adcbfa25c199675e746306bb59d66821e6ecd17e07c99b66a48d827f39acca6c3b012b95371a";
+    sha512 = "844a46ee068ecdc66b7227d089a057ad3f4945114fea2cb280d5e2a383d0a022fc6628ad57c068ea34cf159472f63c50ea7ed128bc11a0b27f16bb7b67d7f3cf";
   };
 
   meta = {

No auto update branch exists
Old version 149.0" not present in master derivation file with contents: {
  stdenv,
  lib,
  callPackage,
  fetchurl,
  nixosTests,
  buildMozillaMach,
}:

buildMozillaMach rec {
  pname = "firefox";
  version = "149.0.2";
  src = fetchurl {
    url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
    sha512 = "844a46ee068ecdc66b7227d089a057ad3f4945114fea2cb280d5e2a383d0a022fc6628ad57c068ea34cf159472f63c50ea7ed128bc11a0b27f16bb7b67d7f3cf";
  };

  meta = {
    changelog = "https://www.mozilla.org/en-US/firefox/${version}/releasenotes/";
    description = "Web browser built from Firefox source tree";
    homepage = "http://www.mozilla.com/en-US/firefox/";
    maintainers = with lib.maintainers; [
      booxter # darwin
      hexa
    ];
    platforms = lib.platforms.unix;
    broken = stdenv.buildPlatform.is32bit;
    # since Firefox 60, build on 32-bit platforms fails with "out of memory".
    # not in `badPlatforms` because cross-compilation on 64-bit machine might work.
    maxSilent = 14400; # 4h, double the default of 7200s (c.f. #129212, #129115)
    license = lib.licenses.mpl20;
    mainProgram = "firefox";
  };
  tests = {
    inherit (nixosTests) firefox;
  };
  updateScript = callPackage ../update.nix {
    attrPath = "firefox-unwrapped";
  };
}