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I have been using Firefox for many years and never had issues. Two days ago, I turned on my HP with Windows 10 and I got a pop up message something about Error Platform 126.0 XUL Runner is not compatible. I could not access Firefox, Google, or the internet. I uninstalled Firefox and reinstalled, but after that, everything runs very slow. Each time I go into a website, it can take up to over a minute to pull up! I cannot even delete email from my Gmail! It's piling up. I checked all the trouble shooting forums in Mozilla and tried just about everything. I went back into About:profiles and created a new profile. It it did not make any difference. I also did a Firefox refresh. Did not help any. I went back into the profile I had before the XUL error because my bookmarks were there. Still slow. I cleaned out the cache, in both Firefox and my Windows 10. made no difference. I only have two extensions in Firefox. I don't know what else I can do to fix this. Also, my drivers and other software are automatically updated by Windows. My HP is only 2 years old as well. Everything was fine in Firefox until that XUL error message popped up and I had to uninstall and reinstall Firefox. That is when everything became agonizingly slow!

I must utilize a radiology based website application that works best in Firefox. I utilize 3 monitors on my system and have Firefox browser working on Monitor #3. Unfortunately Firefox opens the popup windows in Monitor #1. I cannot find a setting anywhere that would force it to open the popups on the monitor that is running the Firefox browser. I do not have this issue with Microsoft Edge, Google Chrome just this browser. I only use Firefox for this application because of this. However, I must use it 4-5 hours a day and this is extremely annoying. Is there any way to fix this issue? In today's technology and the fact that most of us use multiple monitors, I would think this browser would be up-to-date in its options and ability to handle this. Any help would be greatly appreciated.

I have pictures that are slanted. Chrome, and Safari don't do this, so I know it is something with Firefox. Every once and awhile Firefox also has little square dots that appear s’ for ‘Firefox’

If I Close (not Exit) FF and then later Open it, the new Open page is a different size and screen location than when it was last closed (I have to then reposition the page manually).

Is there a ABOUT:CONFIG setting I can can change to stop this?

I want firefox to open a .ics file in google calendar rather than the "Use Calendar (default). I've already run the script linked here : https://support.mozilla.org/en-US/questions/1196085 to register the webcal protocol handler.

The webcal It shows up in the Settings / Genera / Applications list See attachment "Webcal.jpg.

But earlier in the applications list, there is a "Calendar" entry that only allows me to go to the "Use Calendar (default) or ask or save. See attachment Calendar.jpg

It seems like Firefox uses the Calendar entry before it gets to the webcal entry and so it always opens the default windows calendar application.

Help! How do I get firefox to use the webcal entry and not the calendar entry.

Thank you.