workaround - Firefox refuses to open in full-screen mode - possible bug?

I was browsing a site that had a photo set to open in an predefined popup window size of 600x504, which was diverted to a background tab as per my firefox preferences when I clicked on the link. I was tired and had finished browsing, so I closed the parent tab first which left me with a shrunken half-width firefox window, strange I thought, then closed firefox altogether.

Next time and every subsequent time I started a new FF session, it opened in full height, but half width and I had to click the maximise button every time to get full screen. I could not find a setting to change this, other than right clicking on the FF Title-bar and selecting Advanced, then Special Application Settings and forcing FF to open full-screen, but this had some undesirable effects like various dialogue boxes opening full-size.

I quickly reversed this and set about googling for another fix. Lots of windows users reported the same problem, but I could not find anything for Linux, so I thought I'd post my work-around to the mepis site, knowing google will pick it up soon and other users may benefit out of my findings.

I searched the net for an image that had my screen proportions using google image search and I opened it in a new tab, closed the search tab leaving the last tab displaying a picture in full screen, then closed FF. When I opened a new FF session, it opened full screen again.

I don't know what caused it to happen in the first place, but reversing the process by which it happened did the trick. I am guessing this is a FF bug.

Mike P