I just upgraded firefox to v. 46.0 and found out that something funny is going on there.
When performing a right-click the opening window has got a black background and the writing is in white. That used to be the other way round. The same is true when typing something in the adress-field.
However this phenomenon is restricted to the usage of firefox in Linux / Ubuntu 14.04.4 LTS (I am running Ubuntu as a virtual machine utilizing VMware Workstation 12 Player). When running Firefox within my physical machine (WIN 8.1, 64bit) everything is as it used to be (black writing on white background).
Is there anyone out there who has noticed this as well and can tell me more about it? One has to say that the look of it is quite strange and takes some getting used to.