Make sure you are not blocking content.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

One issue that seems more common lately is Firefox's Tracking Protection feature. When it is blocking content in a page, a shield icon will appear at the left end of the address bar next to the padlock icon. This article has more info on managing this feature: Tracking Protection {web link}

For some reason i havent been able reproduce that problem since i posted this question earlier. I didnt do anything to fix it.

Thanks for the help. If i get the problem again i will try those that you mentioned

As long as it does not return. Please flag your last post as Solved Problem so others will know.