Long shot but maybe something in this MozillaZine forum thread will help: See Profile Manager - Create, remove or switch Firefox profiles. To rule out Firefox profile issues (user data and settings) you can try creating a new, additional Firefox profile for testing purposes. by deleting the /Library/Internet Plug-Ins/ugin file? Ref: You did say you deleted the Java plugin before reinstalling Java. ( Bug 616271 - Plugin-like files add overhead on every startup explains why 'rejected' plugins are entered in the section of pluginreg.dat in case it helps.) I don't know why Firefox is seeing your ugin as invalid. I could try downloading Java 7 again in case there's an error in the install file, but that seems unlikely, since Java installation proceeded without error. Do you want a list of the contents (from ls -l)? I don't think that could be the problem if the Java plugin itself is listed as invalid.

I looked into the plugin directory but I wouldn't know what might conflict. Why would the plugin be considered invalid? POSSIBLE CLUE: the Java plugin is listed in the '' section of that file. I deleted pluginreg.dat and restarted Firefox, no help. Every one of the testers you asked if I tried says Java is either blocked or not installed.) 'Enable Java content in the browser' is checked in the security tab of the Java control panel.

I entered the command to refresh the blocklist, but that didn't help because there's no plugin to unblock. Firefox doesn't find it, so I can't enable it. The Java plugin doesn't show in Tools > Add-ons > Plugins. How to download and install Firefox on Mac.Firefox can't load websites but other browsers can.Server Not Found - Troubleshoot connection problems.

Why the hell does Firefox automatically update itself after I specifically turned off automatic updates?!?!?!?!?! 3 profiles with all of my bookmarks are gone.

Plugin Check gives wrong results for some Macs.

plugin.disable_full_page_plugin_for_types: application/pdf.

.x86_64.coolirisembedded.bundle: False.

browser.history_expire_days.mirror: 180.

webglRenderer: NVIDIA Corporation - NVIDIA GeForce 320M OpenGL Engine.

Os x enable java in firefox