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Since Firefox 57 the resolution of certain items is terrible on second screen

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Since updating my Windows 10 machine to use Firefox Quantum, currently on 57.0.1 but has been an issue ever since updating to the beta and now running the latest, I get bizarre resolution issues.

My main screen (laptop) is 3840 x 2160 with Scale at 250% and my screens are at 1920 x 1080 with scale at 100%. When I click on my lastpass manager on one of the screens I get weird resolution in that box. It is not just in LastPass, when I get a login prompt it is also much bigger than it should be. Doesn't happen to any of the actual Firefox menu's though.

If I drag the window back to my laptop screen I can use the plugin properly with correct resolution. I didn't have this issue in the previous version of Firefox.

Any help or ideas appreciated.

Since updating my Windows 10 machine to use Firefox Quantum, currently on 57.0.1 but has been an issue ever since updating to the beta and now running the latest, I get bizarre resolution issues. My main screen (laptop) is 3840 x 2160 with Scale at 250% and my screens are at 1920 x 1080 with scale at 100%. When I click on my lastpass manager on one of the screens I get weird resolution in that box. It is not just in LastPass, when I get a login prompt it is also much bigger than it should be. Doesn't happen to any of the actual Firefox menu's though. If I drag the window back to my laptop screen I can use the plugin properly with correct resolution. I didn't have this issue in the previous version of Firefox. Any help or ideas appreciated.
Attached screenshots

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Issue present in all add-ons I have installed but happens with dialogue boxes too.

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