[Conkeror] Problems with addons compatibility

[Nathan Huesken]

Hello together,

I am trying to instal addons in conkeror.
I added:

user_pref("extensions.checkCompatibility", false);
user_pref("extensions.checkUpdateSecurity", false);

To my conkeror.rc and the extension dialog says:
"Add-on compatibility checking is disabled. You may have incompatible add-ons."

So far so good.
But evert add-on I install (I tried Addblock Plus, Foxmark and GooglePreview) says:
"Not compatible with Conkeror 0.9" and has a red Circle with a white line on the symbol.

Has anyone got GoolgePreview to work?

Thanks!
Nathan