Bug#843105: firefox: gtk3 causes extension popups to have odd size/placement

[Jeff King]

On Thu, Nov 03, 2016 at 04:42:16PM -0400, Jeff King wrote:

> Given that this worked in 49.0-4 and has to do with window creation, I
> can guess it's related to the switch to gtk3.

After some experimenting, this actually looks like it's related to
setting GDK_SCALE=2 in the environment. Unsetting that makes the problem
go away (but makes widgets and fonts tiny with gtk3, as described in
#843104).

-Peff