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You should always use the latest version of an add-on.
Version 6.1.34Released Dec 31, 2020 - 862.46 KBWorks with firefox 60.0 and later* IPv4 & IPv6 address location database updates for December 2020
* Fixed Ping default action
* Removed defunct Header Check & Video Converter default actions
* Removed WOT default action for obtrusive ads
Source code released under Flagfox License