[mountainlion]

Could be that an anti-Virus is blocking Java?

[MV=PY]

I would try uninstalling and reinstalling Firefox.

[ExSoldier]

PC Problems? Get a Mac!

[Tenacious 1]

I don’t know much about computers. But I wouldn’t put coffee in your computer.

[proxy_user]

JavaScript and Java are two completely different technologies. Which one isn’t working?

[FReepaholic]

Are you logged on?

[smoky415]

Have you tried this?

Follow these instructions to activate and enable JavaScript in Firefox.

PC & MAC
1.Open a new Firefox browser window or tab.
2.Copy the following then paste it into the Firefox address bar: about:config
3.Hit the Enter key.
4.On the following page, click the button: “I’ll be careful, I promise!”
5.Find the javascript.enabled row under the Preference Name heading.
6.Double-click anywhere within the javascript.enabled row to toggle the value from “False” to “True”.
7.Finally, refresh your browser.

[867V309]

Java and JavaScript are two different things.

[TomGuy]

Occasionally, Firefox files will get corrupted and the only ‘fix’ is to uninstall and reinstall it from scratch.

IIRC, some later versions of Firefox had Javascript turned off by default.

==

I have so many conflicts with Firefox and Flash/Shockwave and PDF and Java and IE, etc., that I sometimes have to try several different browsers to get one to load the necessary data.

Updates to any of the above software can create more glitches than they resolve.

[McGruff]

I had Firefox do two auto updates over the weekend. Related?

[minnesota_bound]

BTW if you have a pc that is slow, the mouse is jerky, you click on a link or file and nothing happens.

Uninstall Google Chrome!
Once I did and restarted the pc, the pc was back to normal.
I had installed the Google Chromecast app so I could send to the tv what I was seeing on the pc such as a movie or tv show. That part worked ok but I noticed how slow everything got. I checked task manager and saw chrome there and saw it disappear when I closed Chrome BUT there must have been something else that was running. I had even restarted the pc with no affect. I wasn’t until I uninstalled Chrome did the pc get back to normal.

[minnesota_bound]

It could be a addon you have causing the issue and not necessarily java or javascript. You can start Firefox in safe mode to find out.

Start Firefox in Safe Mode by holding down the shift key while starting Firefox.

There is also the link for: Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems

https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#w_how-to-start-firefox-in-safe-mode

[Svartalfiar]

I know you got it fixed, but you may want to look into PaleMoon. It’s a Firefox-based browser, but it strips out most of the bloat and extra stuff you don’t need. Works with most, if not all, of the Firefox addons and extensions. You can also import all your bookmarks and settings from Firefox.

http://www.palemoon.org/