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Unable to use zoom function on flash sites

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Zoom function works, but not on flash sites. Windows 10 64 bit, Firefox 47.0.1 with latest flash addon.

Zoom function works, but not on flash sites. Windows 10 64 bit, Firefox 47.0.1 with latest flash addon.

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Does your system have an UltraHD display?

The Flash plugin does not scale correctly with higher-than-HD displays. This is a longstanding issue... for example, from about two years ago: Playback controls on YouTube and other video players are tiny (Yoga Pro 2 at 3200 x 1800).

Since Flash is something of a legacy product now, I don't think that Adobe is going to fix this, although, you never know...

For another thread last year, I discovered possible workarounds for other Adobe software, but I didn't find anyone applying this idea to the Flash player plugin or, if appropriate, to Firefox's plugin-container.exe process, so I don't hold out a lot of hope:

Another recent thread discussing that possibility: Windows 10 scaling problem