images.dither option not always honored




10 years ago
8 years ago


(Reporter: rossh, Unassigned)


Firefox Tracking Flags

(Not tracked)


(Whiteboard: [CLOSEME 2010-11-01])



10 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/2009032609 Firefox/3.0.8
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/2009032609 Firefox/3.0.8

images.dither  string = false.

That should turn off all image dithering, but often its ignored and small / some / all images are dithered regardless of setting.

Reproducible: Sometimes

Steps to Reproduce:
1. Set about:config option images.dither to  string = false.
2. Clear cache
3. Browse and inspect if dithered image effects continue eg. try a vbulletin post / edit page.
Actual Results:  
Often images are rendered as dithered - ignoring the config setting.  Typically smaller gif images such as buttons and icons.

Expected Results:  
Expect config settings to be honored - no image dithering.

Tested on three different installs of 3.0x, XP and Vista.
No graphical or skin addons used.
images.dither setting was honored for a week, and then it was progressively ignored on all newly rendered images.
Affected images are usually smaller gifs and icon or button styled images.
Affects all common sites - ie. vBulletin images, buttons.
This is a mass search for bugs which are in the Firefox General component, are
UNCO, have not been changed for 500 days and have an unspecified version. 

Reporter, can you please update to Firefox 3.6.10 or later, create a fresh profile,, and test again. If you still see the issue, please update this bug. If the issue is gone, please set the status to RESOLVED > WORKSFORME.
Whiteboard: [CLOSEME 2010-11-01]
No reply from reporter, INCOMPLETE. Please retest with Firefox 3.6.12 or later and a new profile ( If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.
Last Resolved: 8 years ago
Resolution: --- → INCOMPLETE
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