Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: firefox-beta-unwrapped 0 -> 1
attrpath: firefox-beta-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/m56xphdbszh7sacnrz3hn1pg8fy8j5a7-update-firefox-beta-unwrapped.drv
  /nix/store/6xm2k00j37pc4l01j7y8nl0d39q3ar60-packages.json.drv
building '/nix/store/m56xphdbszh7sacnrz3hn1pg8fy8j5a7-update-firefox-beta-unwrapped.drv'...
building '/nix/store/6xm2k00j37pc4l01j7y8nl0d39q3ar60-packages.json.drv'...

Going to be running update for following packages:
 - firefox-beta-unwrapped-154.0b9

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - firefox-beta-unwrapped-154.0b9: UPDATING ...
 - firefox-beta-unwrapped-154.0b9: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix b/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
index f78ba2306d10..8935ef5e314f 100644
--- a/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages/firefox-beta.nix
@@ -10,11 +10,11 @@
 buildMozillaMach rec {
   pname = "firefox-beta";
   binaryName = "firefox-beta";
-  version = "154.0b9";
+  version = "154.0b10";
   applicationName = "Firefox Beta";
   src = fetchurl {
     url = "mirror://mozilla/firefox/releases/${version}/source/firefox-${version}.source.tar.xz";
-    sha512 = "a374ecaf21678f0cca685eed7a09763b3f14ac3d4415c27227a4e06f050042df5e31ade4188d3ab7191102b811b1161638336b41d9de82b9527d39049fe0d3d2";
+    sha512 = "ddbe3ff45217a16df9eecfac52fcb12425accae76457e7054b20bd085f5b22908940a20448f213c3dc62d1276bb1c81f38194432336ba97459b2c17393ebd3cd";
   };
 
   meta = {

No auto update branch exists
There might already be an open PR for this update:
- firefox-{beta,devedition}-unwrapped: 154.0b9 -> 154.0b10
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/552329"