Step 1
Start by downloading the latest .xpi file from here.
Step 2
Open your Firefox browser, then tap the three-dot menu icon in the bottom-right corner of the browser and click on the Settings option.
Step 3
If you haven't already enabled debug mode, go to the About Firefox option and tap the Firefox logo 5 times. If you have already enabled it, skip to step 4.
Step 4
Go back and you will see a new option Install extension from file, click on it.
Step 5
A file dialog will open. Navigate to and select the downloaded .xpi file.
Step 6
A confirmation dialog will appear asking if you wish to install the add-on. Click Add to proceed.
Step 7
Optionally, if you wish to allow the extension to run in private browsing mode, find the extension in the list, click on the Details button, and then enable the Allow in Private Browsing checkbox. Congratulations! You've successfully installed the latest build of this extension in Firefox.