GNOME's extension site is reporting that "You do not appear to have an up to date version of GNOME3. You won't be able to install extensions from here. See the about page for more information." Even though I have GNOME 3.4 (on Fedora)
On Midori, the page displays correctly and I can install extensions. I only get the above message on Firefox.
Additional System Details
- The Totem 3.4.1 plugin handles video and audio streams.
- DivX Web Player version 126.96.36.199
- This plug-in detects the presence of iTunes when opening iTunes Store URLs in a web page with Firefox.
- User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Firefox/17.0