It says . ..
"If you use your Linux distribution's packaged version of Firefox, you will need wait for an updated package to be released to its package repository" I don't exactly know what that means..
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If you are using the version of Firefox that came with your Linux installation, updates are handled through the Update Manager in "System".
If you installed Firefox yourself with a separate download from Mozilla, the Help > Check for Updates menu item appears and is active so you can do manual updates.