Yeah, I have been using Firefox since 2007. I don't experience any crashes or bugs regarding performance or usability. But I have been facing issues with websites which don't work at all or developed with only Chrome in mind. And I have been facing this issue enough times that whenever I see a problem, I have to reopen the site in Chrome to confirm that Firefox is not the problem. I think this is a major problem, and as developers ignore Firefox or any other browser, web will be unusable without Chrome.