Firefox won't Force Quit?

Interesting... in my case both macbooks and my mac mini had the problem. After performing a clean install in the mac mini the problem was solved. As I didn't have the time to do it in the macbooks they still affected.

Do you use development tools? Python tools, Android or arduino drivers? I'm starting to think this might be caused by the interaction of FF with some software + the yosemite to El Capitan update.

No, I do not use any development tools. Other apps which may be running include Mail, Calendar, Word, Outlook (rarely), iTunes, Pure Music, Lightroom.

My development days are far behind me. These days I am no more than a power user.

I like Firefox and the concepts of community around it, so do not want to leave. But I will eventually run out of patience, I suspect.

I'm still getting this, despite my thought that it had been fixed by removing MacUpdate Desktop.

For me it still only affects Firefox, and no other app, and I get the problem if anything tries an auto restart of FF, such as an update, or an installed or updated Add-on. If I manually quit it, it's fine.

As well as my previous CLI tips for restarting the Dock, I have found that you can force a Restart by using 'sudo reboot' in the Terminal too (assuming you still want to do a restart anyway, it just save a bit of typing).

I must admit I can remember when exactly this started to happen now, although I'm fairly sure it has been since upgrading to 10.11.

Just happened again today, with the update to 46.0. Instead of clicking on 'Restart Firefox to update' I tried quitting the program and then starting it again from OSX. When I did this the update worked successfully. However, when I quit Firefox it did not quit properly and required a hard shut down of my system. Same upgrade, on my identically configured laptop, no problem. Go figure!

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?

It could make difference. In my case all systems updated to El Capitan (3) are suffering from this bug while clean installs are not affected.

In your case it's half.

I'm suspecting that the upgrade process might be breaking something in Firefox or vice-versa.

FWIW, it's more likely that something was installed that is causing an issue with Firefox. That would explain why a clean install doesn't affect it. It's not the upgrade process.

One thing users could try is create a new Firefox profile.

I've had this problem continuously now even after re-installing 10.11 to a clean install, as well as more than once deleting and reinstalling Firefox from scratch.

It's still the only app that this happens with, even other browsers work fine.

Cheers

Andy

I've tried to create a new profile and to reinstall Firefox and none of them worked for me. I even search for all files/directories containing moz or firefox in the name and erased. Nothing worked.

In my case the El Capitan clean install fixed the issue (at least for now).

Same here TheWildRover, Firefox seems to be the only app affected by this bug.

Apple found the problem (at least in my case). If I stop the "Rapport Trusteer Endpoint Protection" and restart Firefox the problem stops to happen. Basically If the service is running when Firefox is started than I get the problem again.

Rapport is required by my bank (Banco do Brasil) to access the Internet Banking as other major banks around the world.

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

I used to use Rapport but switched to another browser for banking (since Firefox has been unstable). I cannot find it in my present Firefox set up, when I went to test your suggestion. Maybe I am missing where to look for it -- where do you find if it is installed?

Thanks for your help.

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.

Oh blimey, I cannot believe it was that simple. I too have Rapport installed (for Santander), and just tried it with Rapport disabled, and got FF to immediately install an Add-on and restart without any problems.

Hopefully that's sorted it.

I'll probably just try to remember to enable Rapport and use Safari when I want to go to my banking site, then disable it afterwards.

Cheers.