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- Click on the right most icon in the firefox tool bar(3 lines)
- In the popup, click "More Tools"

- Click "Remote Debugging"
OR
- Alternately you may go directly to about:debugging
- choose "This Firefox"

- Click "Load Remporary Extensions" button

- Enter/Choose folder of plugin
- Choose
maifest.json
- The plugin will be shown as loaded
Update Settings of plugins with settings
- Click on the right most icon in the firefox tool bar(3 lines)
- In the popup, click "Addons and Themes"
OR
- Alternatively you may go directly to about:addons
- Click on your custom plugin and

- Click on "Options" tab
