У вашего броузера проблема в совместимости с HTML5
How to Take ScreenShots in Mozilla Firefox?
1. Open Firefox Browser on your computer.
2. Right click on the empty space at top of the Firefox browser and select menu bar.
3. This displays menu bar.
4. Now, Go to Tools and Select add-ons.
5. Click on the Get Add-ons Tab.
6. Type Screenshot into the add-ons search box at the top right of the browser.
7. Find Screenshot in the list and click on Install.
8. Restart Firefox to complete the installation.
9. Now you can see a tiny icon in the address bar.
10. Click on the drop down button and Hover your mouse on save.
11. Select complete page or frame to capture the entire page.
12. Select Visible Portion to capture only the visible portion.
13. This is how you can take screenshots in Mozilla Firefox.
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