Superb addon, but WARNING... Rated 4 out of 5 stars

Although an excellent addon, which I've used for over a year now on multiple machines, there's some suspecious activity I've detected...

If you monitor your tcpip traffic, once in a while, this addon appears to "phone home" to check4change.com and sends usage stats along with a unique identifier, and all other addons you have installed, as well as the url of where this is used, and I think the address of other tabs which may be open.

You can check if this is doing it for you by simply checking for the 'check4change.com' unique id cookie once in a while.

I've reported this behaviour and tracking to the author several months ago, but sadly didn't receive any reply back. So I'm forced to post this here to warn others.

To defend against this spyware technique, I've blocked the check4change.com cookie and multiple domains related to this addon.

Otherwise, it's an extremely useful addon, and for this reason I'm still giving it 4 stars.

Simple, and works great Rated 4 out of 5 stars

Almost exactly what I was looking for, although It's still missing one feature to be perfect, hence the 4star review.
It would be great if you could add the feature where it notifies you on a specific change, like if a text field has 3 possibilities A, B and C, I would like it to notify me only when it changes to let's say B.
But either way a great add-on :)

Great add-on Rated 5 out of 5 stars

This is a great add-on. All the features work as described. It would be awesome if it was available for Android!

Really helped me Rated 5 out of 5 stars

Check4change is great plugin. It's simplistic but very usable. It really helped me and even impacted my life to some extent :).

Thanks Ronen :)

Rated 5 out of 5 stars

Cool!!! It is very helpful for me to monitor changes in the web pages without need to stay up ALL the night. Amazing!!!

Check4Change Rated 4 out of 5 stars

Почему в настройках программы нет других языков,в точности,русского?.Не все понимают иностранный язык.

Yay :D Rated 5 out of 5 stars

The update is very much appreciated, many thanks! This is one of my very favourite addons.

This review is for a previous version of the add-on (1.9.8).  This user has a previous review of this add-on.

This now works with Firefox v.45 Rated 5 out of 5 stars

Thank you for updating this add in. This works now with Firefox v.45 and really happy to use this again.
Thanks for your quick response and update for this Add In

This review is for a previous version of the add-on (1.9.8).  This user has 2 previous reviews of this add-on.

Doesn't work with Firefox 45.0 Rated 3 out of 5 stars

Doesn't work with Firefox 45.0. It does not reload the page after countdown

This review is for a previous version of the add-on (1.9.7). 

Doesn't remember settings Rated 2 out of 5 stars

Not bad, but jobs are completely deleted when you close your browser and you have to re-create them whenever you launch your browser.

This review is for a previous version of the add-on (1.9.7). 

new function Rated 5 out of 5 stars

Hello! Please add 'stop check' hot key.

This review is for a previous version of the add-on (1.9.7). 

c4c Rated 5 out of 5 stars

really great addon

This review is for a previous version of the add-on (1.9.7). 

Great functionality Rated 5 out of 5 stars

I got how it worked in 2 minutes. It is a great add-on to monitor changes (on forum pages for instance).

This review is for a previous version of the add-on (1.9.7). 

Was quite awesome, but is it abandoned now? Updated: No, it isn't Rated 5 out of 5 stars

C4C has lost its notification pop-up and sound alert functionality around FF 32, and, yet nothing was done to restore it.
Was not able to contact the developer even through the contact form on the addon's site (also have a problem with C4C VIP program after donating, the link I got through the mail just wouldn't activate)
Would be great again if updated, I just know it.

Update:
1.9.6 fixed all the issues I was having. Nice to see the functionality back, way to go!

This review is for a previous version of the add-on (1.9.5.1-signed). 

Rated 5 out of 5 stars

Напишите точно такое расширение для Chrom пожалуйста?

This review is for a previous version of the add-on (1.9.5.1-signed). 

Rated 5 out of 5 stars

This add on makes it very easy for me to refresh my webpage until a change is noticed on the page. This helps me work a whole lot faster doing my daily activities. I am glad that I found this add on for mozilla.

This review is for a previous version of the add-on (1.9.5.1-signed). 

Rated 4 out of 5 stars

this is very useful and nice, but something is missing. The missing part is monitoring the entire site, without selecting anything, monitoring for an image change, or any of the page content. Add this and it will be very useful.

This review is for a previous version of the add-on (1.9.5.1-signed). 

Hello. Chinese version? Thank you. Rated 5 out of 5 stars

Hello. Chinese version? Thank you.

This review is for a previous version of the add-on (1.9.5.1-signed). 

Genial!!! Rated 5 out of 5 stars

Gran trabajo. Gracias por esta maravilla. En cuanto tenga dinero hago una donación. Un saludo

This review is for a previous version of the add-on (1.9.5.1-signed). 

Rated 4 out of 5 stars

I have 3 tabs open and reloading at a rate of 2 minutes but the tabs will stop refreshing after about a couple of hours and just say "loading". I understand that this could possibly be due to a lack of memory but I have 8 GB of RAM and no other programs open. If it were not for that issue this add-on works beautifully.

This review is for a previous version of the add-on (1.9.5.1-signed).