Update the Firefox UA for quirks

See #5182

doc/changelog.asciidoc

@@ -55,6 +55,7 @@ Fixed
   documentation in our settings docs now loads a live page again. (#8268)
 - A rare crash when on Qt 6, a renderer process terminates with an unknown
   termination reason.
+- Updated the workaround for Google sign-in issues.
 
 [[v3.2.1]]
 v3.2.1 (2024-06-25)

doc/contributing.asciidoc

@@ -792,7 +792,8 @@ qutebrowser release
 * Make sure there are no unstaged changes and the tests are green.
 * Make sure all issues with the related milestone are closed.
 * Mark the https://github.com/qutebrowser/qutebrowser/milestones[milestone] as closed.
-* Consider updating the completions for `content.headers.user_agent` in `configdata.yml`.
+* Consider updating the completions for `content.headers.user_agent` in `configdata.yml`
+  and the Firefox UA in `qutebrowser/browser/webengine/webenginesettings.py`.
 * Minor release: Consider updating some files from main:
   - `misc/requirements/` and `requirements.txt`
   - `scripts/`

qutebrowser/browser/webengine/webenginesettings.py

@@ -452,7 +452,7 @@ def _init_site_specific_quirks():
                   "AppleWebKit/{webkit_version} (KHTML, like Gecko) "
                   "{upstream_browser_key}/{upstream_browser_version} "
                   "Safari/{webkit_version}")
-    firefox_ua = "Mozilla/5.0 ({os_info}; rv:90.0) Gecko/20100101 Firefox/90.0"
+    firefox_ua = "Mozilla/5.0 ({os_info}; rv:131.0) Gecko/20100101 Firefox/131.0"
 
     def maybe_newer_chrome_ua(at_least_version):
         """Return a new UA if our current chrome version isn't at least at_least_version."""