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Why does webpage content appear distorted and wy do videos not operate?

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When I open a webpage or try to start a video, they do not work properly. The appearance of webpages is distorted. Videos do not run.

When I open a webpage or try to start a video, they do not work properly. The appearance of webpages is distorted. Videos do not run.

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Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)


Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).