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

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.

they fixed the issue

"alarm Sound" not playing if i play in fullscreen game. FireFox 63.0.3 Windows 10 x64

I was using this to check for a test date cancellation to open up at a testing center that is booked up until January. I thought I was going to have to sit at my computer non-stop for days checking and competing with many other students to find an opening. I installed C4C not knowing if it would help or not. Within 45 minutes the song played to notify me and I thought it was a mistake. Nope, grabbed a test spot in 2 weeks, it was unreal. I still can't believe it happened.

welllllllllllllllll

Great extension, but it's missing random interval refresh so I can put refresh interval like between 10-15 seconds or 20-30 etc...