Temporarely loading local Firefox add-ons is a straightforward process. Loading them permanently takes a few more steps:
- Download and install Firefox-developer version.
- Disable the xpi signature verification in about:config:
3. Go to the extension directory and generate a xpi file:
cd path/to/extension_name zip extension_name.xpi *
4. Go to about:addons.
5. Drag and drop
extension_name.xpi into the add-ons tab
6. Click in the add-on and select "Allow automatic updates" and "Run in private windows".