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blocks of Web pages missing when using Firefox

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Blackblocks appear on Web pages when using Firefox on Samsung tablet

Blackblocks appear on Web pages when using Firefox on Samsung tablet

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What site? Do you use the NoScript extension?

This generally is a symptom of the device not containing the characters that the page wants to display.

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It's on all websites I visit. Never had this problem before. Refreshing page or minimising doesn't help. Only happens using Firefox. No issues on Chrome.