Version 1.22 tweaks epubjs-reader for better page turns on mobile devices when reading in a browser. You can enable epubjs-reader as the in-browser reader in config. I would appreciate any feedback on this feature.
Version 1.23 released, incorporating upstream changes in COPS 2.7.1
Version 1.24 released. The add-on now allows you to specify a different folder name than books within HA’s media folder, in case you mounted your Calibre Library to a different location, or have it in a different folder, for whatever reason. Default is still books, so should work fine with existing installations.
Note that if you are using the rsync feature to sync your Calibre Library to the HA server, the command for that has not changed - rsync maps books in the backend to the location you specify in the configuration.
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Version 1.25 added to incorporate COP 2.7.3. I’ve also changed the default page to the listing of the 50 most recently added books rather than the top level menu of lists. You can still get to this list by clicking the home link at the top left, but the initial page now gets you to your books faster.
Version 1.26.1 incorporates changes on COPS 3.1.3 and adds list of series by author in the author page in the bootstrap5 template.
Quick fix resulting in 1.26.2 
I managed to forget to update the integrity hashes for the newer version of bootstrap and didn’t see this in testing. Fixed. 1.26.3 out now. Apologies if this broke anyone’s library yesterday - update to get the fix.
1.26.4 - added Portuguese translation - thanks @horus68!
New release - 1.27.1 - incorporate latest changes in COPS 3.2.2 and fix an issue that may have prevented configuration settings being respected that started with 1.26.1
I didn’t use addon for a while and always update to to latest. Now i noticed that downloading isn’t working anymore?? (I tried different browser) Do i need to do additional settings to allow this? This was always working perfectly with my kobo reader.