Add-ons don't show up in add-on manager

When I go to Tools > Add-ons, the page does not work in the following ways:
* Clicking on Extensions yields a blank frame
* Clicking on Get Add-ons displays "Loading..." and it never completes
* Clicking on Appearance yields a blank frame
* Doing a search always finds nothing
I tried following the steps outlined here: (https://support.mozilla.org/en-US/questions/941626?esab=a&as=aaq), which are deleting extensions.* and compatibility.ini, but that did not help.

Awesome, got it fixed.
I followed ideato's advice above, and everything worked. Except for some reason my browsing session wasn't there--probably my fault for failing to copy one of the files properly.
But anyway, that gave me an idea. So in my existing profile, I deleted some extensions that I thought might be problematic from the extensions/ directory and then deleted the following files:
* addons.sqlite
* addons.sqlite-journal
* extensions.ini
* extensions.log
* extensions.sqlite
* pluginreg.dat
After deleting these files, I started my default profile. Firefox found my extensions and asked me if I wanted to install them -- which I did -- and then everything worked fine again.
Thanks!

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