Since more than a year, multiple Google websites, e.g. Google Search, Google
Docs and Gmail, do not work well with the Firefox software included with
openSUSE Tumbleweed. It often happens that loading one of these websites
stalls. Logging in to a Google account doesn't work at all.

I don't see this issue if I download Firefox binaries from the Mozilla website
and load my existing profile (firefox/firefox -profileManager).

Does this perhaps mean that there is a problem with changes made to the Firefox
software that is available from openSUSE?

Tumbleweed version:
$ rpm -qf /etc/issue.net 
openSUSE-release-20231117-2596.1.x86_64

Firefox versions:
$ rpm -q MozillaFirefox
MozillaFirefox-119.0.1-1.1.x86_64

Binary downloaded from the Mozilla website: firefox-119.0.1.tar.bz2