Favioli - Add an Emoji Favicon to Any Website
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Add-on summary
This app was meant to solve a problem for me where a lot of internal sites for my work don't have favicons and are bureaucratically difficult to change.
For the security minded: This extension needs access to website data in order to automatically modify favicons of every page online. There is currently no feature for name-spacing permissions to only overridden sites because this would break auto-replacing on other sites. I would be very open to merging a feature along these lines.
Code is open-source on Github. I will never sell/give Favioli to any third party, because I don't want anyone to abuse it, or use it for anything other than replacing favicons with fun images.
User reviews
Add-on safety
Risk impact
Favioli requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
Favioli has earned a fairly good reputation and likely can be trusted.