Can't uninstall add-ons.

I know this question has been asked numerous times before, but nothing I've found has been able to help me. It also doesn't help that the search results are a bit pathetic in my opinion when you're trying to solve things on your own.
Having said that, I have two issues which I think are related. First, my add-ons won't uninstall. They all install correctly, but they won't uninstall. All of the ones I want to unnistall simply state "This addon will be uninstalled when Firefox is restarted." But, that message never goes away despite me restarting when I originally try to uninstall them. I still have the restart message on the addons dialog box, but when I press it Firefox restarts but the addons are still there with the above message.
The second issue is that Firefox takes FOREVER to open up (a couple minutes at least) and then proceeds to grow enormously on my RAM. I could definitely use some more memory, I'm not going to argue about that, but since the last big update (with plugin container I think, which I disabled) the browser has become a memory behemoth. Much more so than before. I don't even have that many addons, but wonder if the ones still there are affecting performance.
I tried a couple of techniques found in the help section, like deleting the addons manually (their files and folders) through the screen where you get a warning or something about changing Firefox. I'm not too tech-savvy so I don't remember all the exact names of stuff, but that didn't fix the problem.
I don't know if this is pertinent or not, but when I first got Firefox, several versions ago, I downloaded the addon FoxyTunes. I never ended up using it and thought I had uninstalled it but I don't think it ever fully left. It was still listed in my Add/Remove Program list (I had to go the registry to remove it) and occasionally I'll still see it pop up for a faction of a second in the lower right hand corner of the screen if the computer is hanging.
If it's possible I'd rather not have to do a complete uninstall/re-install of Firefox just because of the inconvenience of going through and re-downloading updates, addons, bookmarks, losing the most visited sites from my address bar, etc. When I first started using Firefox, it was extremely fast and reliable and that's what I'm trying to get it back to. At this point, my IE runs better which isn't saying much.
Any help would be greatly appreciated. Thanks in advance.
P.S. I have version 3.6.11, even though it says it's best guess is that I have 3.0.3

Create a new profile as a test to check if your current profile is causing the problems
See [[Basic Troubleshooting|#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins"
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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