Perhaps another browser is called for now that Firefox has turned out to be rubbish.
Always a dangerous assumption that the software is at fault, when having admitted a lack of skills, the obvious suspect would be the wetware.
Click tools/options/tabs & ensure everyhting is to your satisfaction in there. in extremis, if you absolutely cannot get it working right, download & run CC Cleaner from Piriform.com (and nowhewre else) - this will tidy up a large number of problems on systems, but it would be a sledgehammer to crack a nut in terms of repairing Firefox - which by the way is a fine browser.