Firefox won't Force Quit?

I've found my solution now too, all has been well since I removed the MacUpdate Desktop software.

By disabling hardware acceleration you might have performance issues. In my case it didn't fix it anyway... 😟

I also don't have MacUpdate installed in my machine.

In both computers you had installed Yosemite and then performed the upgrade to El Capitan? Did any of them came with El Capitan pre-installed or had a clean install instead of the upgrade?

Both were upgraded to El Capitan. Does that make a difference?

I use Rapport as well, and I'll be you're correct that it's the source of the problem.

gnomen if it's installed you will find it in your System Preferences. It's calledTrusteer Endpoint Protection. You need to stop it and than start Firefox.

I've turned Rapport off and I'm planning on seeing how it goes over the next few days. I've filed a bug report with the Trusteer guys that include links to this conversation; we'll see what they say.

Thanks for that. Firefox was freezing overtime I updated it and I ended up with two icons in the dock which wouldn’t force quit. Stopping Rapport has sorted the problem.

Hold the on/off switch and hold till the mac switches off. Then start normally.

That's what I do. Thanks.

Trusteer is a Windows app and the mac version is just s**t, like antivirus apps. The Trusteer uninstaller does leave several files behind. So it may also cause issues.

Interesting. Do you recommend not installing Trusteer on the Mac, then?

My bank (RBS) is pretty insistent about it.

same issue.. none of the "fixes" work.. don't have those programs to remove.. just FF refusing to quit and stopping the mac from restarting by preventing the shutdown