Firefox Community Forum

I was trying to do something with my bookmarks yesterday and I must have pushed the wrong icon. Firefox then became unavailable. I'm 88 years old and not fully at home with computer language. I tried Chrome, but it's not available like Firefox.

How can I resolve the failure to open because it can't find the XPCOM. I downloaded a new copy but the computer insists on using the older, faulty version to open files and it will not work.

Firefox browser does not open when I click on the short cup. Instead it opens 2 small windows, one is a website I visited previously and the other is Firefox settings. Why is this happening? I have Windows 10 on my computer but that should not have anything to do with the Firefox browser or search engine not opening. When it opened the small screen that only showed Firefox settings I clicked it to open in full screen and now there is no option to make the screen smaller or exit the Mozilla support page. And, now with this full screen I can't even do a screen shot to show you what I am talking about. Does anybody know what is going on with this?