Это расширение позволяет, следить за обновлениями элементов страниц, например узнавать актуальную версию той или иной программы не открывая сайт. Имеются настройки отслеживания, уведомлений и различные фильтры, но многие из них сложны для людей не знакомых с HTML, JavaScript, CSS и т.д. В версии для Firefox 57 и выше чтобы корректно обновить некоторые страницы требуется открывать маленькую вкладку, так как в фоновом режиме не все содержимое прогружается.

Your're gonna save a lot of time for a ridiculous price

One of my favorite firefox extensions! Thanks for FF57 support. I also use it to monitor local files e.g. "file:///B:/Backup/backup.log", but this new version has problem with monitoring these files, it will be great to support these urls too, thanks.
Edit: maybe access to filesystem from extensions is not allowed in new FF, I have added backup folder into apache virtual-host settings and now I can monitor backup logs too

Best web monitor out there! Very easy to use and error free. Fast tech support also. They have answered all my questions.

Have only noticed minor issues, so far so good. Thanks for the update!

This version must be broken. When I try to go to Watchlist, I can't get anything... I get into Distill interface but I get a yellow Loading warning but nothing happens... I can't import my setting from legacy distill cause of that... Can u guys fix this?!

Such a great addon. Props to the dev for working out this new one.

Hope it more stable not abuse the resource.

This is the best extension for monitoring websites, or specific parts of websites, for changes at an interval specified by you. Has an email support.

when installing I get an error that says it appears to be corrupt