How do you go about doing that?

Good question zero3k !

I think that thanks to all the changes already made to k-meleon74 / 1.8 since the beginning of november 2013 the plugin.container problem with its full screen incompatibility remains one of the most urgent problems to solve for k-meleon.
Otherwise k-meleon risks again to lose its followers.
In modern age where computer screens get bigger and bigger all the time - up to 27 inches - and for a lot of people already replace televison the incapacity to see films, videos etc in full screen mode is not a good pub thing that is the least that one can say.

I hope somebody out there can solve this problem. It would be much appreciated !!

Mala

Only possible with windows XP

You can disable plugin container for all mozilla browsers if you add the environment variable MOZ_DISABLE_OOP_PLUGINS. Not a practical solution.

I don't have flash anyways...