Sorry for my probably bad english, i'm French...
I will resume my problem by step.
1. Before this problem, i didn't have two monitors, but an only one. there wasn't Firefox's resizing problem.
2. Then, I've bought a TV, plugged on my laptop (HDMI). It has a greatest screen resolution than on my laptop.
3. Now, if Firefox's windows is on my TV : There isn't Firefox's resizing problem...
4. Then, if Firefox's windows is on my laptop, the probem is here : There is a big Firefox's resizing problem...
Indeed, by using an firefox addon, i have this problem
-> By using a firefox extension, its display is truncated, almost hidden.
My question(s) :
Is there a way to prevent this?
Else, Is there a way to make firefox believe that the current monitorhas a high screen resolution?
The screen resolution is set by the EXTERNAL device every time. The PC can only handle ONE resolution with ONE graphics card. Before you disconnect the external monitor, select WIN-P and select Screen only.