Difficult to explain problem with full page zoom in Firefox
 

I use Firefox and it look that it has got some strange problem with full page zooming.

When I zoom out images develop a blackish outline around them which looks ugly. However on zooming >= 100% the problem disappears.

What should I do to avoid this problem.

Image with zoom < 100%
http://img13.imageshack.us/img13/9823/problematj.jpg


Image with 100% zoom
http://img83.imageshack.us/img83/6883/nproblem.jpg

Try not zooming out. Or a different browser.

"My car is noisy. Then, you don't drive it." Well this is not a solution.

Based on the problem description you gave, that's the best you can get. You don't say what kind of document(s) you're viewing (which could affect things), or if you've even tried any other browsers.

Also, zooming in and out is ALWAYS going to affect an image, no matter what. Information in the image has to be compressed or expanded, where there isn't any, causing distortion. Don't want the distortion? Then don't expand/contract the image, or resize the original to be what you want.

Well I understand that. But that border doesn't appear when I use FF3 on windows or other Linux computers. What I feel is that this may be due to some GTK settings.

I don't think gtk has much to do there. Maybe Cairo or whatever gecko uses these days as rendering background. You can always try to report a bug to the mozilla people and see what they can tell you.