When opening Safari I get this error:
Now I want to uninstall this extension, however it doesn't show up in the Extensions preferences:
How do I uninstall this?
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That doesn't look like an extension, but a SIMBL Plugin.
These can be found in the directiory
/Library/Application Support/SIMBL/Plugins, and you should be able to remove the
SafariOmnibar.bundle from there.