Really not doing anything in my case.. I still need to do hold down the shift key and click refresh button in browser to actually clear all the browser cache.. Just using this addon doens't fully clear my browser cache.

Using F9 key (with no option to disable it) is a great disadvantage - I need this key for other operation in application. I had to remove this add-on.

I used this extension with FF for years and would give it 5 stars, but had to switch to another when I updated to WF v56.0.1 64-bit as the icon becomes HUGE. I read the developer fixed this in other versions but it's not quite fixed yet for all Mozilla forks.

Update: 10/5/18 Issue persists. :(

55.0.3 (32-bit) the changes are not saved. At every FF start the addon revert on default settings, including "reload active tab" and "show notifications".