I love this add-on, but the lack of a search function is a massive inconvenience. If you have a lot of feeds it becomes next to impossible to find specific ones, or to troubleshoot problems with particular feeds. While you can do a browser 'find' to get feed titles, there's no ability to search for feed URLs, for example.

This becomes a massive problem if a feed becomes compromised or generates errors (as happens often enough to be an issue), because the error message or security software warning will give only the URL of the offending feed, making it next to impossible to actually find the problem feed and remove it (at least, not without going through hundreds of feeds manually one-by-one until you find the problem - something that would easily take hours to do).

It seems like such basic functionality, it's frustrating that I can't search the information that the add-on has gathered - feed name, url, etc.

Another frustrating issue is that it's very difficult to organize feeds when moving to a new device. I used to have all of my feeds arranged neatly in folders based on genre, etc. and when I tried to transfer all that over, it did not export my folder hierarchy, it only exported the feeds themselves. I now face hours of re-sorting them, and the tools for sorting are not great.

Having said all that, I use this add-on avidly and have for years. At its core I believe it's the best add-on of its kind available for Firefox.