Not much to add here but wanted to say I very much support having more people show video demos when they do show hn.

I use bookmarklets for a number of simple things.

My most used is to copy text where the formatting has been stripped, the bookmarklet prepends formatting instructions, and then I paste the whole thing into claude which sorts the formatting.

Me thinks I've underestimated what can be done with these.

The authenticated-page support is what caught my attention. Being able to grab an internal dashboard or admin UI and get editable Figma layers from it could save quite a bit of tedious recreation work.