About Permissions
Some users have asked about why some of my add-ons have certain permissions. Some of the permissions listed on the Firefox Add-ons website look very scary, like the Access your data for all websites permission used by many add-ons. In the interest of full transparency, the permissions used by this extension are detailed below:
This permission is required in order for the add-on to see the URL that you are visiting. This is necessary because each URL you visit needs to be compared to the list of URLs that you have chosen to block. This will determine whether the extension allows the page to load or tells Firefox to stop the loading process.
The add-on does not see the content of the websites you visit, nor does it log your activity. This permission is given to the add-on solely so that it can filter the pages you are trying to visit.
When you export your block list from the add-on options, Firefox treats the saved file as a "download", even though it comes entirely from a file that's created by Firefox not a website server. For this reason, the add-on needs to be able to "download files" for the importing and exporting of settings to work properly.
You will be asked to grant this permission the first time you try to export your block list.