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Steam Achievement Guide extension for Firefox
(addons.mozilla.org)
Steam is a video game digital distribution service by Valve.
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Issue tracker for Linux version of Steam
Yeah it could be. Though my guess is, the client cannot connect to the source of the achievement guide for some reason.
Not sure where that report an error goes but the developer does have a discord channel. Here
I don't use Discord but I found the dev's email.
Edit: And did my part.