Firefox freezes for at least 5 seconds when opening context menus

Well I've been looking for a reason to switch to Chrome... I guess now i have one.
Problem: Firefox freezes for 5 seconds when opening context menus (screen goes gray for @3s)
Firefox 32
Ubuntu 12.04
I first noticed it this morning when I tried to open up a Bookmark menu. Continued testing and found that right-clicking(anywhere) caused the same behavior. There are tons of posts going back years of similar behavior (although I doubt they're all related), so I ran therough the standard troubleshooting steps (restarting firefox after each step):
* cleared the caches
* Lowered cache memory allocation
* Created a new profile (did not carry-over any previous bookmarks or add-ons)
* Restarted firefox in safe-mode.
* Reset firefox (from safe-mode command)
Restarting firefox with all add-ons disabled is not included here because that is assumed in 'created a new profile' (correct?).
Furthermore, when I went to reinstall I got the error: "E: I wasn't able to locate a file for the firefox package. This might mean you need to manually fix this package."
I don't know what happened over the weekend, but I guess I'll try a full manual reinstall, when I have more time to mess with it. FF has been a primary tool for development, but for now it's dead to me.
P.S. On an unrelated issue. Maybe I'm old-school, but I miss the original drop-down menus up top. I don't think there's anything wrong with improving on the existing model, but why would you replace something that's worked well for DECADES.

Thanks for your response and sorry for the delay in my rep[ly.
Today I tested the Linux-64 version (Firefox 33) from the link you suggested. There weren't any install instructions or a README, but based on the file-system layout I guess it just needs to be extracted. I downloaded and extracted to my Downloads directory and ran the executable via command-line as my user (not root).
Firefox popped up right away, but it was not usable for at least 30s. It asked to import from Chrome which I did (no errors). Every click on the top bar (address bar search, buttons to the right of search, bookmarks toolbar) resulted in a dimming un-dimming sequence of @7s, after which nothing (couldn't focus in the address bar, occasionally the bookmark menu would appear, but was not functional). Basically, it's un-usable.
As I mentioned in an earlier reply, I am having similar problems with Komodo which is apparently also Mozilla based.
Are there any logs I could tail and post that might help track this down?
Not sure what to do at this point.

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Den 25/08/2014 kl. 20.39 skrev Sabian Zildjian <[email protected]>:
adobe reader installer freeze with out downloading Adobe Reader when opened?
created by Sabian Zildjian in Enterprise Deployment (Acrobat and Reader) - View the full discussion
Is it the Download assistant that is freezing or is it the web browser that freezes?
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