Merge #103474: firefox, thunderbird: revert meta.timeout

pkgs/applications/networking/browsers/firefox/packages.nix

@@ -26,7 +26,6 @@ rec {
       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.
       license = lib.licenses.mpl20;
-      timeout = 28800; # eight hours
     };
     updateScript = callPackage ./update.nix {
       attrPath = "firefox-unwrapped";

pkgs/applications/networking/mailreaders/thunderbird/default.nix

@@ -332,6 +332,5 @@ stdenv.mkDerivation rec {
     ];
     platforms = platforms.linux;
     license = licenses.mpl20;
-    timeout = 28800; # eight hours
   };
 }