Firefox is very bad, UC browser is also sometimes not supportive of using an exchange. I am more comfortable using Google. Google's popularity and security is very good. we should avoid browsers that have a poor security system.
I guess you don't read
this message posted ahead of you because every systems at a point have it own vulnerability and just because this situation happened to Firefox doesn't mean it totally a bad browser but if you prefer to you chrome browser just make sure you're using the incognito window by pressing Ctrl+ Shift + N.