It works fine, but requires some performance overhaul. It slows down overall tab loading significantly... so I have needed to disable it.

Please consider updating this extension to Manifest V3 to take advantage of its improved security and privacy model, and to better support a “click to activate” style of usage where access is only granted when needed.

The amount of data this add-on collects from its users is mind-boggling.
https://readwise.io/privacy

It works great but lacks conditional permissions, i.e., it cannot be loaded on click or only on specific domains. This is a limitation with Firefox’ handling of all Manifest v2 add-ons, so the plugin must be updated to Manifest v3 to give us the same privacy controls as it already does in Chromium based browsers.

Readwise and the team behind it are incredible thinkers and the work they've done so far is simply transformative in terms of how it has opened up my ability to focus on creativity first - productivity is just a by product of the workflow. Thank you for building and continuing to refine your product - I cannot wait to see what improvements and enhancements you've thought of. Cheers!