This is a really interesting project considering Pocket is built in and developed by Mozilla. I wish you the best of luck.

Interesting use case to develop something for. Really like the idea, I'll be trying it out for sure!

What does Reading Anxiety mean in this context ?

I think they mean having too much in your "to read" list that it becomes overwhelming. I didn't realise that was a thing.

"A Firefox extension to fight reading anxiety by limiting the maximum number of stored articles and automatically expiring them after 30 days."