As another review mentioned, this doesn't work on firefox until you add a cookie exception for raindrop.io. Go to settings, search for cookies, and click 'manage exceptions' and add raindrop.io.

This service for saving links Raindrop has successfully replaced Pocket, which has become inconvenient and unavailable in some browsers. Saved links (exported) from Pocket were all imported into Raindrop. It is easy to save links in it, easy to view later on other devices, in other browsers.
Этот сервис сохранения ссылок Raindrop хорошо заменил ставший неудобным и недоступным в некоторых браузерах Pocket. Сохраненные ссылки (экспортированные) из Pocket удалось все импортровать в Raindrop. В нем легко сохранять ссылки, легко просматривать позже на других устройствах, в других браузерах.

If you have problems with the extension:

With cross-site cookies disabled the add-on doesn't work at all

you need to add raindrop URL to cookie exceptions

Gives easy and instant access to Raindrop.io and is nicely configurable.

not working

I've been using Raindrop as my go-to online Bookmark manager for years now, as I was fed up with the outdated interface of FF Bookmarks.
It's a brilliant app for organising your online life, and the addon does everything you need, I couldn't be without it!!!

With cross-site cookies disabled the add-on doesn't work at all - just prompts the user to log in (with a link), and then when you click the link it takes you to a page that tells you to click the add-on.

great for bookmarks