Well, that didn’t last long. Firefox 43.0.3 disabled SHA1 security certificates, but that caused a lot of problems for some users, and Mozilla has rolled back the change in the new Firefox 43.0.4. Most users won’t notice the difference, but if you started having problems browsing secure web sites after installing 43.0.3, that issue should be resolved with 43.0.4.

Firefox 43.0.4 also fixes a crashing bug affecting some users, and at least one other change is documented in the release notes.

Incidentally, there wasn’t a proper announcement for the new version. The closest we got was a post on the Mozilla security blog about the SHA1 reversal, which doesn’t mention Firefox version identifiers at all.