Note that this update also applies to other Mozilla Foundation software, Thunderbird and SeaMonkey. The new versions are 3.0.18 and 3.5.8, respectively. Fixed an issue causing buttons on the tab bar to be resized when loading certain websites (bug 1704404) Fixed an issue which caused tabs from private windows to be visible in non-private windows when viewing switch-to-tab results in the address bar panel (bug 1720369) Various stability fixes. Use Firefox’s built-in updater, or download a new version of the browser here.
Some of these crashes showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could be exploited to run arbitrary code. Im using the Add-On Classic Theme Restorer with FF 45.9 ESR for example. But firefox isnt the browser I use for e-mailing, its just for certain sites Im relatively sure that wont lead to malware. Mozilla developers identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. But 45.9 is also one of the last Firefox versions to support alot of the good Add-Ons. The Mozilla Foundation’s security advisory states: If you’re running the latest version of Firefox – version 3.6 – you don’t have to worry, but if, for some reason, you’re running one of these older versions, you should update them now. The Mozilla Foundation has issue security updates for older versions of its Firefox browser, patching versions 3 and 3.5 to correct a critical vulnerability. Security & Privacy Firefox Updates Older Versions of Its Browser