Firefox prevents page reloading?

Hello and thank you for looking at my thread.

I use firefox as my browser for the internet but recently firefox has been preventing pages from automatically reloading.
I most usually didn't have to continually click "allow" once I gave approval to a page however this is become a regular thing. Having to click allow continuously, even for sites that I have been to hundreds of times before. "Hotmail" for example or "ninemsn" reload and I have to click allow several times. It is getting very tedious.

Is this a glitch or a problem with an update or do you think this is a normal situation?

I get all the updates and can only assume that it has some area, that I haven't ticked in the options box or something, for it to remember which pages I have previously allowed.

Can I overcome this constant clicking of allowed pages please?

Thank you ImnoGuru.