Firefox is very slow, doesn't look right and all history and bookmarks gone

This happened just after I installed a proprietary software that I needed for work.
When I launched Firefox afterwards, I realized that all of my bookmarks and history was gone. The websites were loading very slow. My Firefox sync configuration settings were gone.
Also, when I search Google and put the cursor over the links that appear, the cursor usually turns to a hand symbol. Now it turns to a text cursor (like an I). The links are usually colored blue, but now they are colored black.
I'm using Chromium instead of Firefox now, and it appears to be working OK.
Tried disabling all the addons. Didn't work. Then uninstalled and re-installed Firefox. No luck. Uninstalled Firefox, deleted all folders containing "firefox" as part of the name in "/usr/lib", and re-installed Firefox. Didn't work.
Maybe the proprietary software that I installed altered the user permissions to some folder so Firefox is not able so access them? I don't know. If you have any ideas let me know.
I would really like to get Firefox working properly again, because I'm so used to it, and use addons like Zotero. Also, I have Windows in dual boot, and I have Firefox running there, and everything I do there was synced to Firefox in Ubuntu. But not anymore :(.
Thanks.

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This kind of issues are, unfortunately, more common and the we'd like. Thankfully, 99% of the cases are very easy to solve. However, you do need to diagnose what your exact problem is. Do this:
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