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Why are some websites displayed with added question marks inside black diamonds

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Numbers are displayed with question marks inside black triangles before and following, possibly as column separators.

This happened

Every time Firefox opened

== I attempted to access financial websites

Numbers are displayed with question marks inside black triangles before and following, possibly as column separators. == This happened == Every time Firefox opened == I attempted to access financial websites

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Can you post a link?

You can try a few different encoding settings: "View > Character Encoding" like Western ISO-8859-1 or another Western encoding or UTF-8 You can also try to switch on Auto-Detect: "View > Character Encoding > AutoDetect > Universal"

A diamond with a '?' usually indicates that a character is missing in the font that is used on a website or the wrong encoding is used. You get the '?' on websites that use an 8 bit encoding like ISO-8859-1 or a Windows encoding like Windows-1252. This issue can happen if content was copied from one 8 bit or Unicode encoding to another encoding.