FireFox upgraded to version 40.0.2 today and in the addons there is a warning: JetBRains FireFox Extension could not be verified for use with Firefox. Proceed with Caution.
It provides a link in "more info" to https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct
I am running Windows 7 64bit.
Phpstorm version: 8.0.2
Just thought someone might like to know.