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How to re-resolve issue previously resolved in archived thread: "How to disable tabs in Firefox desktop version?"?
The issue "How to disable tabs in Firefox desktop version?" was previously resolved. The solution given no longer applies, and the relevant thread has been archived:
What is the re-resolution?
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Also: I tried unsuccessfully to install a similar extension, but received incessantly the error message "Download failed. Please check your connection.", despite no connection issues whatsoever:
In the Menu > Options area, look for "Open links in tabs instead of new windows". Make sure the box is not checked.
Also, with any link, you can Right-Click it and in the Pop_up, there's an option to 'Open Link in a New Window'.
WebExtensions Stops Working - Worldwide Bug-a-Boo - The Fixes:
Additional Info: From Mozilla Blog:
Updates – Last Updated: 19:28 EDT May 8 2019
We’ve released Firefox 66.0.5 for Desktop and Android, and Firefox ESR 60.6.3, which include the permanent fix for re-enabling add-ons that were disabled starting on May 3rd. The initial, temporary fix that was deployed May 4th through the Studies system is replaced by these updates, and we recommend updating as soon as possible. Users who enabled Studies to receive the temporary fix, and have updated to the permanent fix, can now disable Studies if they desire.
For users who cannot update to the latest version of Firefox or Firefox ESR, we plan to distribute an update that automatically applies the fix to versions 52 through 60. This fix will also be available as a user-installable extension. For anyone still experiencing issues in versions 61 through 65, we plan to distribute a fix through a user-installable extension. These extensions will not require users to enable Studies, and we’ll provide an update when they are available.
"Updates – Last Updated: 11:51 EDT May 8 2019
Firefox 66.0.5 has been released, and we recommend that people update to that version if they continue to experience problems with extensions being disabled. You’ll get an update notification within 24 hours, or you can initiate an update manually.
An update to ESR 60.6.3 is also available as of May 8th. We’re continuing to work on a fix for older versions of Firefox, and will update this post and on social media as we have more information."