Flash and Video Download
https://addons.mozilla.org/en-US/firefox/user/download-flash-and-video/?src=api
Flash Video Downloader
https://addons.mozilla.org/en-US/firefox/user/artur-dubovoy/?src=api
I also use Video DownloadHelper
After installing to Firefox you right click on the grey area by the address field and click on Navigation Toolbar and Menu Bar and Add-on Bar (bottom of screen)
Right click on the grey area by the address field and click on Customize
Now drag the Video add on’s to the bottom of the screen so the top does get so crowded.
I also like “Classic Theme Restorer” add-on. Gives back the look of Firefox instead of it looking like Chrome.
https://addons.mozilla.org/en-US/firefox/addon/classicthemerestorer/