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What are the pros and cons of not backing up .cache/mozilla/firefox/*.default on a linux system?

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I'm performing a backup of my home directory on Ubuntu linux. I only want to backup what's necessary. Is it necessary to backup ~/.cache/mozilla/firefox/*.default  ?

I'm performing a backup of my home directory on Ubuntu linux. I only want to backup what's necessary. Is it necessary to backup ~/.cache/mozilla/firefox/*.default ?

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That's the location of the "web cache" in Firefox. https://en.wikipedia.org/wiki/Web_cache