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No Close Buttons by Dirkjan Ochtman

Not compatible with Firefox Quantum

Firefox 57 and later unfortunately do not support the APIs needed to make this work. A workaround is described at https://github.com/djc/no-close-buttons.

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Add-on Links
Version
0.1.2
Last updated
a year ago (Nov 1, 2016)
License
Mozilla Public License, version 2.0
Version History
Release notes for 0.1.2
Added multiprocessCompatible flag. Addon seems to be working for me and most other users, despite using low-level Addons SDK APIs. As far as I can see, there are no high-level SDK APIs or WebExtension APIs that could replace the APIs used.