Полностью бесплатное приложение с открытым исходным кодом. К сожалению, в дополнении нет возможность выделить интересующую область для отслеживания изменений - как это сделано в Distill Web Monitor и Otsledit. А на нынешних сайтах со множеством динамического контента и десятками независимых блоков без это функции пользоваться приложением тяжело. очень много ложных срабатываний. Из плюсов - отсутствие ограничений на количество подписок. В отличие от упомянутых выше продуктов.

In General, a good addon. But it hasn't been updated for a long time. Some issues are still not correct in the new release. And apparently the development is completely stopped. For more than half a year or more, there is no developer activity in the addon repository.

It's a very usefull extension. But I don't understand why regulary all pages disapeared and I need to import again my pages...

This is amazing! Works just as well as Visualping in my experience. Thanks.

Meine Erfahrung mit "Update Scanner": sehr unzuverlässig!
My experience with "Update Scanner": very unreliable!

JA TESTEI VARIOS
ESSE E O MELHOR!!!!
ERA BOM SE ESTIVESSE PARA ANDROID

This is my favorite regarding page monitors. Unlike visualping and co. it has no limits and runs on your machine.

Feeds should be Alphabetically arranged

great plugin, took some time to get right on new ff api. as any developer knows backup, backup backup.
it is not update scanner fault firefox completely changed the api and killed all dynamic addons that were able to do real things.

youtube channels/pages fail to scan properly
www.pscp.tv/ScottAdamsSays gives javascript error

Pretty useless due to lack of proper changes threshold.