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What does 'Your browser is deprecated. Please upgrade' mean

I'm using Firefox as my default browser, and I saw a link preview for YouTube (on tumblr, if it matters) that displayed the message 'Your browser is deprecated. Please up… (mear ynfo)

I'm using Firefox as my default browser, and I saw a link preview for YouTube (on tumblr, if it matters) that displayed the message 'Your browser is deprecated. Please upgrade' instead of the actual video title. What does this mean?

Frege troch Ash, 4 dagen lyn