[_sdfo]

In case scraping doesn't work for a certain link, you could have a "limited" update feature: Download website html, compress and hash it and store locally; each update cycle, download it, compress, hash and compare to local copy. If it has changed, then simply light it up in the UI. For me, simply seeing that there's something new on the site I want tracked is enough information so I can visit it and check out the new article myself.

Of course, false positives are a downside. Someone fixing a typo shouldn't count as an update. I'm sure the community can think of settings for the "update sensitivity" where level 0 requires at least a new tag to appear on the page, level 1 requires a change of at least N characters, and level 2 notifies on even a change of one character.

I love this extension already and am willing to help out with PRs :-)