Works great, but you must first select the text you want to check for changes and then click on the c4c icon.

Bought the premium version for emails feature with the intent to have it work with a website you book reservations on - they just updated their website to latest HTML code as I bought this version. This app is so old that new pages that use updated HTML styles can't have the elements on the page detected with check4change. Appreciate what the developer does here, but if you're going to expect people to pay for your premium services - at least respond to emails if you're not going to bother updating the app after 3 years, but still take peoples money.

David Bowie - Changes
December 1971

This is a solid Addon

A wonderful add-on.

This extension is extremely valuable to me and has enabled me to capture and take advantage of changes that occur every second...awesome!!!

Sehr gutes Tool. Benötigt ein wenig Einarbeitungszeit, aber ist es wirklich wert. Greetings from Germany.

very simple to use and really convenient

Very good for monitoring server status change for a game (waiting for maintenance to end, for example).

ma non va piu il servizio vip

Last updated 2 years ago. The main reason I would use this extension is for order pages that I may have closed, then opened later eg AliExpress price changes. So after a session Aliexpress needs logging in again and the tab is no longer original, hence it does not work. Sadly, uninstalled.

简单有效

When it works, it's amazing. There's to my knowledge no other tool like this one to keep track of reservation spots and such on websites.
Lately, been having issues with mailing system and site appears to be down.

When I have to spend half an hour figuring out how to set a bookmark icon back to the right icon after using an extension, it's a bust. This extension will change the bookmark icon for a website that you want to monitor to the c4c icon, which is the kind of thing adware/malware likes to do...