Free Download Manger plugin works fine
Point your browser at the URL "about:config", then right-click on the preferences list to bring up the contextual menu. You should see an option that says "New." Select that, and choose "Boolean." When it asks you for the preference name, type "extensions.checkCompatibility" (without the quotes). You have to enter the name exactly. For the value, choose "false." Now restart Firefox. When the browser comes back up, it should give you a warning that version checking is disabled. You can double-check under "Tools:Add-Ons" to make sure everything is activated once again.
Link please. I use to use a download manager plugin (Download Manager Tweak 0.7.2) that worked great with FF but it stopped getting updated and that was that. Need new one.
a bad idea (but if your desparate to get older plugins working) probably at the expense of problems...
http://www.computerworld.com.au/index.php/id;488470447
i'd rather live without the addon if its not compatible... but at least the option is there for those who like to tweak
there is a beta/experimental version of TabMix that works with Firefox 3. I have had some compatability problems with TabMix Plus and HeaderSpy (which also works with Firefox 3). Basically, when both are enabled, Ctrl-F4 will close 2 tabs at a time. If I disable either one, it works fine.
So, for the time being, HeaderSpy is disabled as TabMix Plus offers much more usable functionality.