I believe one of the addons caused the problem. When I visit aliexpress it changes the url into "best.aliexpress.com" and changes the search results where some of the sellers are highlighted and framed with flashy banners. It sometimes causes crashing other shopping websites as well. I tried deleting my profile, uninstalling firefox, deleting site data, cookies, cache, scanning with 3 different antimalware programs, deleting mozilla folder on %appdata% it also closes my aliexpress tabs when I open multiple tabs of a product from different sellers, it redirects them all to the best.aliexpress.com homepage the moment I look away. I tried firefox mobile browser that I logged in with my account and is on synch with the desktop browser. When I visit aliexpress it can't redirect to best.aliexpress.com and asks "Would you like to leave firefox to view this content" and I tap on cancel and no further problems occur. When I'm looking at an aliexpress page, it always asks "Would you like to leave firefox to view this content" without me tapping on anything, or when I'm trying to check out a product. When I tap on Cancel, it still opens the page I want to see without redirecting me to anywhere. When I create a new profile with Run>Firefox -p, it stops redirecting me to the best.aliexpress.com problem but altered search results are still there with certain sellers being highlighted and advertised. I don't see them on mobile. I really like firefox and don't want switch to other browsers, even if it doesn't fully work for some websites with the dark mode addon, and some website developers are only considering chrome when designing a website. I still don't want to use any other browser. So please help me with this problem. Again, it only causes firefox desktop version to misbehave, not many problems with mobile version other than occasional asking "Would you like to leave firefox to view this content"