Firefox 126.96.36.199 is optimized for Leopard, fixes bugs, creates others
Here are just a handful of those issues:
- Problems with some media plugins
- "Close Other Tabs" may fail when you have more than 20 tabs open
- Macromedia Flash content may not play on Intel-based Macs
Update: Mozilla points out that the update does not create new problems for the Leopard version of Firefox. Rather, Firefox did not perform very well at all on Mac OS X 10.5 until the release of Firefox 188.8.131.52. This update, however did not resolve all the known issues, which is why some still remain.
The latest version of Firefox includes some important security updates, but it will probably be a little longer before you'll find a release that's fully compatible with Leopard.