About privacy, this extension collects NOTHING at all.
I defined them as follow in the manifest.json: "permissions": [ "storage", "tabs" ]
1. Storage: To save settings of this extension (this may trigger the permission to access all data. However, only settings of this extension is accessed)
2. Tabs: To reload tabs when settings changes (i.e click on Apply button, check URL to blacklist websites,...).
I just follow the tutorial on Mozilla website. (https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Implement_a_settings_page)
Furthermore, you can view the source code of this extension to make sure that everything is safe. (https://superuser.com/questions/771825/how-to-examine-source-code-of-firefox-extension-before-installing-it)
