SO frustrating! Unable to comment on blogs with Firefox/Google Chrome

I keep trying to comment on various blogs and because I'm using Google Chrome and Firefox, I can't comment on a lot of them. For some reason on the majority of blogs that don't have a popup comment box, it doesn't accept the cookies that say I'm logged in, so no matter which option I choose to log in as, it doesn't recongise my comment and it won't preview or send off the posts! It also appears that I'm not the only one to have this problem, however, Mozilla haven't done anything to fix it as yet :(

I know, first answer is to get internet explorer. I've tried that, but it won't install on my crappy old computer (I've tried different versions and everything, it just won't install!). Ugh! I feel really bad because I keep trying to leave comments on the blogs I love and only some of them work :(

So if you have a blog like that you might have more people who want to comment than you expect, but they might be unable to comment due to the browser they use.

I guess I'll just have to save up and get a new computer :(

PS To my followers who might not have gotten comments from me, that's probably why! I am commenting in spirit, I promise!

EDIT: I have now given in and successfully installed Safari and now I can comment on those blogs.. prepare yourselves for an onslaught!