I have installed / de-installed and re-installed firefox on my mac and have had a lot of problems. When I used my PC I always used firefox but it isn't working on my macbook. Firefox is constnantly looking for upgrades but then doesn't actually upgrade and just gets stuck. I downloaded peal crescent (which worked prior to my de-installing and re-installing) and now all PNG and JPG files don't save properly and seem to come out as gibberish (they do hve .jpg and .png at the end)