It *is* maddening to get a thread asking for computer help, and then no relevant information as to the problem itself, forcing us - those of us who love to help - to dig and dig for information from the person having the problem.
You might not notice this, because you've probably never clicked on a thread of someone needing computer help, but it's pretty standard to get informationless requests for help.
That said, it's no reason to castigate you too severely. I"m only saying that I understand the frustration, and the desire to strike out, after it's happened a hundred times.
It does become maddening when it happens again and again and again.... much easier if people would just post their problem to begin with, instead of "HELP ME!!!" and then force the helpers to do all the work of figuring out what the problem is before they can even begin to help solve it.
And even after Ompha's request for OS, Firefox version, and other information, you have it all buried in various places in your description, and still didn't give the version number of Firefox you were trying to install.
As to your specific problem, I don't have much to add other than that I had an add-on once that went all crazy on me (it was a weather one), and no matter how many times I deleted it, it was still there. I even deleted Firefox itself in the hopes that the *@(& add-on would disappear, but when I reinstalled Firefox, the %(#& thing showed up again.
Could be a problem with Firefox that it won't really delete add-ons, or maybe some add-ons are just written by assholes. I could never figure it out. Thankfully, it never affected the operation of Firefox; it just sits there in the corner of the Firefox window giving me weather data for some place I have no idea where it is, but certainly isn't here.
I began to think after that experience, and still do, that Firefox doesn't actually allow one to delete it entirely - there's always some part of it still there on the hard drive, ready to fuck up the next installation of it.
The initial problem I'm having (dognose if I'll have more once I get past this first one!) is that the home page --nor any other page, I even tried democraticunderground.com next!-- is that on the very bottom left of entire screen it says "Transferring data from flickr.com..." and then nada but a blank window and stalled progress bar.
I don't know what "dognose" means here, nor what you mean by "the home page", but it appears that for some reason Firefox is trying to download something from flickr.com (which is a photo hosting site, like photobucket and so on), and it can't get a response from flickr.com. How long have you let it sit there and try to get something? Usually, after a short time, the bowser should just give up and say something like "Couldn't find page". However, since you say the words "transferring data from flickr.com" is on the bottom left of the screen, and not the browser window, that means something is really messed up. It should only show that in the browser window, as it always does whenever one goes to a website.
But you say you that you tried other websites and got the same thing?
Very odd.
Very odd indeed. I wish I could think of a reason why it would do that.
I shall meditate on this, and see if the brain storms anything helpful.