Drupal 8 will remove the ability to disable modules for many reasons. See #1199946: Disabled modules are broken beyond repair so the "disable" functionality needs to be removed and many other issues in the queue of various core and contributed modules.

This is also postponed on #2081873: Re-implement module disabling in a temporary/development capacity that is simultaneously suitable for production environments - so there's still a chance this module will not be needed for drupal 8.

This module will bring back the ability to (temporarily) disable modules from the UI.

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