That could be a useful feature. It's got vibes from the 90s, when there were a lot of different browsers and some of them allowed users to annotate pages and links [1]. I'm sure that there are a number of extensions to do that and still it's OK to have it in the browser by default.

[1] https://scholarlykitchen.sspnet.org/2013/04/30/iannotate-wha...

Nice to see Firefox experimenting with browser features, even small stuff. I don’t think this solves the user problem they mention though.

> This work is inspired by user research that we conducted last year, which explored how people resume tasks after interruptions. One key insight we learned is that when we are interrupted, even a small reminder or message can significantly improve our ability to resume a task

Interruptions are unplanned for. Don’t think I’d be preemptively leaving notes on my tabs to defend against interrupts. Especially since tabs are an ephemeral interface. Much more likely that useful notes go into an actual knowledge base (i.e. the other note tools mentioned).

For a browser tab, I’d prefer to have automated lineage/metadata (e.g. I opened this at X time, branching off Y page, etc) that I can use to deduce where I’d left off.

> There are only two ways to make money. One is to bundle; the other is to unbundle. —Jim Barksdale

The original (or just the Firefox 3-era Places revamp?) bookmarks implementation in Firefox had a multi-line field to jot down a personal note or add a description of the page. Even bookmarks folders were allowed to have descriptions—see the New Folder dialog in this screencapture at ~1 minute in <https://youtu.be/QoJXmLuGM3s?t=60>

The "Description" field was removed in 2018. <https://bugzilla.mozilla.org/show_bug.cgi?id=1463738> Being able to capture and redirect the resources that would have inevitably gone into the maintenance costs of this feature over the last 8 years is likely to be the reason Mozcorp has been able to stay afloat on their meager budget that they have to carve out of their half-a-billion-dollar revenue stream stream year after year. Giving users uninterrupted access to Descriptions over that amount of time would likely have bankrupted them.