upPrev stopped working on FF22

the plugin stopped working on Firefox 22.

I can’t confirm.

On upprev.com works perfectly, see screenshot.

https://upprev.com/?attachment_id=268

Well, actually I see now that it stopped working for me at all.
See here for example:
https://tinyurl.com/lnyc6kl
What should I look for?

Try turn off new plugins.

Found the problem with Jetpack by wordpress.com

After turning off and on upPrev returned to work.