Mozilla has released a new version of the Firefox browser for all their supported platforms, bringing it up to version 126.96.36.199. This release has come relatively quickly compared to their usual release cycles and is intended only as a stability update to 188.8.131.52. It seems that post-release, 184.108.40.206 was found to have several new issues including crashing, addons being disabled and Java being broken in Windows Vista.
None of the issues seem to have security concerns, though it is still good to see the Mozilla team works fast to resolve problems they do find. If you are using Firefox, grab the update!