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This add-on requires a newer version of Firefox (at least version 61.0)" - Why can't I install this add-on, even tough I am using a current Firefox version (66.0.5 on Linux/Fedora)? :
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How to Install Firefox on Linux Mint, Ubuntu, Debian or any other Linux distribution – libre-software.net – Linux, Firefox, LibreOffice
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Updated to Firefox 81.0 but credit card autofill is still missing from Options/Preferences menu | Firefox Support Forum | Mozilla Support
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Install Firefox: Linux, Ubuntu, Arch, CentOS, Debian, Fedora, Mint, OpenSUSE, RHEL, and Manjaro - Linuxuntu
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