I love it. In all sincerity: why is this "not recommended"?

Worldbrain is a manager and annotation tool for web content. For me, it's the best I've used so far. The main features are:
* Organizing your links trough tags and collections;
* Searching and filtering these links trough the Memex's dashboard;
* Indexing;
* Annotation tool / highlighter;
* Backup (to a hosting service or offline);
* Nice UI (although it has some things to improve);
* FOSS.

For me, the main issues are:
* Instability: I don't know how the tests are done, but may be almost exclusively automated and/or few/none manual testing are done in Firefox before releasing an update. Twice it happened that Memex broke in the last 3 months or so. This time, in version 1.5.0 (Jan 6, 2020), the main features of tagging, putting links in collections, etc stopped working.
* Can't rename tags (it's possible to rename collections though);
* Can't tag files in general (PDFs, images, etc);
* Searching at "Add Tag(s)" or "Add To Collection(s)" only consider first term/word of tags.
** Eg.: You have a tag named "my tag" or "my-tag". If you search for "my", it will find it; if you search for "tag", it won't find it.
* Filter uses logical disjunction, not having an option to use conjuction instead;
* Can't reposition sidebar to left side;
* No mobile app (yet);
* No dark mode (yet).

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Updates:
2019-12-08
* added 3 issues;
* removed 1 issue: "Issues to backup if adblock is enabled".
2020-01-10
* added 1 issue: unstable;
* edit rating: from 4/5 to 3/5.

If you guys use Bash and Terminal, you can try a little Bash Script I made. It does not randomly index URLs, it visits each URL from a URL list "de novo" and greps their web content in a while loop…
If you want to check:
GitHub link: https://github.com/mountaineerbr/scripts/blob/master/urlgrep.sh
Cheers!

Frezzes js on all tabs and extensions every 3-5minutes

Gmail doesn't work with this add-on.
Contact can't connected.

Benefits: A really functional piece of software: you can annotate websites, bookmark them quickly, share links to highlights on any website!

Drawbacks:
The only disadvantage is the UI. It's a bit rough at the moment.

Having said that, I prefer that each entry does not have a picture, because some websites don't have good pictures. We shouldn't want to pick out from our saved lists based on their pictures, but rather on their content.

Improvements?
I would like to have the collections side bar permanent on the side, and the google drive backup working.

Excellent, j'attendais ces fonctions depuis longtemps et je suis pas déçu. A plusieurs reprises j'ai pu retrouver des pages web impossible à retrouver par les marques pages ayant oublié le titre.

brilliant concept+most complete execution for nowadays