This small GitHub extension automatically hides all the successful actions.

To Install it:

• Open a terminal
• Clone the repo
• Navigate to the root path folder
• Type in the following command

zip -r -FS ../my-extension.xpi * --exclude '*.git*'

• Then open the following url in browser about:debugging
• Click 'This Firefox'
• Click 'Load Temporary Add-on'

enjoy!