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(Browser Specific Issues and Workarounds)
failed to open in Firefox when the 1Password extension is installed.
The issue appears to happen when installing a new extension (not necessarily 1Password). After installing a new extension, Firefox can no longer open links from external applications. Thankfully, a solution was reported in the forum. You need to open Safari and set it as the default browser in the Safari > Preferences > General window. Once completed, restart Firefox and then set Firefox as the default browser. This fixes the issue, at least until the next time you install another extension, at which point you need to repeat these steps.