I have been using Karakeep after Pocket discontinue. I mainly use it in browser and there are extensions but I just use it with Single File extension as I already have installed.

I haven't tried it yet, but came across savr the other day. Looks promising

savr: Read it later. Keep it local. No server needed. — Savr is an app for saving online content to read later. It is file-centric, offline first, future proof, and favors decentralization.

PWA, extension for FF and Chrome , optional sync via Dropbox or own storage

@readeck@mastodon.online is great with a firefox addon