I couldn't upload an image for the questions so here it is. Forgot to mention after the problem I several times reinstalled firefox...same result

hope anyone can help

thx Prikje

hi Prikje, can you test firefox safemode - you can also invoke it by pressing the shift-key while you launch firefox...

thx Philip In safe mode I can see text but still no idea where to fix the problem.

while in safemode could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

also the first thing i would try is to disable hardware acceleration in the firefox menu ≡ > options > advanced > general (that setting will take a restart of the browser to take effect).

You can try to disable OMTC and leave hardware acceleration in Firefox enabled.

• about:config page: layers.offmainthreadcomposition.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

Phillip & Cor-El ,

thank you for the solution , I disabled the hardware acceleration and the problem was solved. This was the first time I needed help to fix a problem. Appreciate the time you took to help me !

best regards Patrick