Unsupported screenshot mime type: image/vnd.mozilla.apng about witnessme

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Ran into the same issue as well. Traced the issue down the Pyppeteer itself, though not sure why it's happening yet:

https://github.com/pyppeteer/pyppeteer/blob/7486b56c072be469f5d9f7ac797f59ecea2a5c65/pyppeteer/page.py#L1249

[Update 1] I did a kludge patch in my install of Pyppeteer, looks like my scan is running now. Basically added to the conditional in that line of code. If I end up with usable screenshots, I might end up opening an issue or PR with Pyppeteer.
[Update 2] It worked. Changing line 1249 of /usr/lib/python3/dist-packages/pyppeteer/page.py to if mimeType == 'image/png' or mimeType == 'image/vnd.mozilla.apng': What a mess, though I don't think it's a WitnessMe problem.

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@weuroi578 in case you're still hoping to use WitnessMe ^ Hope that helps for you.