Download

Chrome

signed and hosted on GitHub, read the installation instructions below

Click on the add-on link and save the add-on in your computer
Open Firefox and enter about:addons in the url bar
Select Extensions on the left side if it isn't selected already
Click on the cogwheel ⚙ button next to the search bar on the top right
Select Install add-on from file and select the add-on you saved in your computer
Click Install after the add-on signature verification finishes