I've tested the official Ubuntu Firefox package and it's all the same. The problem occurs in it, too.
P.S. Concerning the unofficial package I use, it's for the smooth scaling of images option which is turned on in this package. This is the ppa: https://launchpad.net/~firefox-smooth-scaling/+archive/ppa
I've tested the official Ubuntu Firefox package and it's all the same. The problem occurs in it, too.
P.S. Concerning the unofficial package I use, it's for the smooth scaling of images option which is turned on in this package. This is the ppa: https:/ /launchpad. net/~firefox- smooth- scaling/ +archive/ ppa