Still for 52.7.2 version one could install any theme. Unfortunately for 52.7.4 it turned out to be impossible. The only message one can see is to install Firefox instead. What has happened and how to solve the problem?
You need to install a compatible theme, make sure the theme version your installing supports 52.0 ESR branch
What theme are you using?
Could be the themes manifest needs updating for its version
While we were not encountering your issue, we did discorver that Mozilla has changed the code how they read browser user-agents
causing the Cyberfox user-agent to make Mozilla addons offer get Firefox button over the install button, a default user-agent override
is in testing and will be in next browser release so not to cause the get Firefox button to show.
Best watched in full screen or download the video to watch locally.
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