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There was a problem accessing your browser storage, some features may not work properly for you. It is likely that the browser doesn't support storage or the quota limit has been reached. In Firefox, corrupted storage can also cause such a problem, clearing your "Offline Website Data" might help. In Safari, such problem is commonly caused by "Private Mode Browsing".
Fixed in phpmyadmin:4.6.6
Middle button paste does not work
We cannot click the middle button to paste something into the SQL textarea with firefox.
This is a combination of bugs in firefox and CodeMirror which is used by phpmyadmin.
See relevant entries in the bug trackers of each project:
#3554 copy paste with middle mouseclick in colored sqlbox
Paste by using middle click in firefox not working #931
Bug 846674 - cannot capture paste event from window or document
Solutions: As a workaround, CTRL+V works.