Firefox 29 for Mac deletes pixel infos when downloading a picture
When dragging a picture to a finder folder Firefox does no longer save the information about height and width in pixels. These infos are just cut out. Even if I right-click on a picture link and say "show image" it opens in a new tab as always but in the header of Firefox there is no longer the number of pixels in the image displayed. This started about may 11 or 12 2014. I guess with the update to version 29.
Opaite Mbohovái (1)
I found that after Firefox v29, a LOT of my settings and
add-ons were changed / reset. Try this;
Start Firefox in Safe Mode
While you are in safe mode;
Firefox Options > Advanced > General.
Look for and turn off Use Hardware Acceleration.
Then check ALL of your settings. Browser and add-ons. Then restart.