Ideas:
Maybe work with the bookmarks api instead (store feeds and favorited items there?) and use browser history for "item read". And/Or reduce stored data:
hash item url to make it shorter and only store "item read" flag, other information can be obtained when feed is fetched on startup
sync storage is very limited
Ideas: Maybe work with the bookmarks api instead (store feeds and favorited items there?) and use browser history for "item read". And/Or reduce stored data:
Check used storage: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/StorageArea/getBytesInUse