Yeah, the error is occurring because the result image size is greater than the canvas size. I'm looking into fixes for this in [bug 1743887](https://bugzilla.mozilla.org/show_bug.cgi?id=1743887). In the meantime, if you flip `screenshots.browser.component.enabled` to true in about:config, it should work as long as the zoom is 100%.
Bug 1800623 Comment 3 Edit History
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Yeah, the error is occurring because the resulting image size is greater than the canvas size. I'm looking into fixes for this in [bug 1743887](https://bugzilla.mozilla.org/show_bug.cgi?id=1743887). In the meantime, if you flip `screenshots.browser.component.enabled` to true in about:config, it should work as long as the zoom is 100%.