Why no Nightly Tester Tools - isn't this exactly what they're for???
NTT is obviously disabled, and any attempts at finding a new version that *can at all be installed* are thwarted, despite popup buttons on the Mozilla addon pages for installing anyway.
The addon dialogue, that has obviously been moved to take up a tab and make all operations more convoluted (no more simple one-click...), only shows that NTT 2.0.3 has been disabled.
No "Enable" button available. No "Options".
No button to check for updates either, until you click a tiny link that says "More". Clicking this "Update" button makes *nothing* happen, not even any indication of something gone wrong, or things working but no update available.
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The author of NTT has stopped developing it, for details see Where is the updated Nightly Tester Tools?
An alternative add-on that you can use is Add-on Compatibility Reporter, with that add-on incompatible add-ons will be automatically enabled, allowing you to test them to ensure they work with the beta builds.