Firefox Downgrade and Reinstallation

About once a year, I go through the steps of completely uninstalling Firefox, deleting associated folders, and reinstalling the browser. This has an amazing impact on the performance of the product.
Even though the settings in Firefox are to not send any information to Mozilla, or retain data, a large number of files are being collected in the AppData folders.

In Firefox version 35, Mozilla added a feature called the “Hello Chat Video Service”, in the form of a button the toolbar. Around the same time, several of my favorite extensions began having compatibility problems with Firefox. To restore functionality from these extensions, I decided to downgrade to a lower version of Firefox.
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