This is now the 5th AddOn of this kind that I am using. This finally seems to do what was promised.

It does it job! Perfect for web developers, thanks!!!

There is no notification when cache is cleared (ff 61.0.1)

Fungerar mycket bra!
Vill ha till alla webbläsare!

exelente

I've used this for a long time and would give it five stars. My only niggle is that now there's a notification (in the latest version) that the cache has cleared, it lingers too long, and thus hides other notifications!
Perhaps a shorter notification, or the ability to choose how long it shows?