Text-box generated link cannot be copied for Firefox version 58.0.2 and 59.0.1 on Ubuntu 16.04

[ashishrana160796]

The link upon generation from Generate link button cannot be copied for Firefox browser but it works fine for other browsers like Opera. This issue is confirmed for above latest versions and following linux OS.

[CharlesZ-Chen]

Thanks for reporting this bug! Um... I didn't test it on Firefox at that time. After a quick googling, it seems this is a bug of Firefox browser, and they suggest to use readonly instead of disabled as a workaround to solve this problem: https://bugzilla.mozilla.org/show_bug.cgi?id=253870

A more ideal implementation would be something similar to the "copy commit" function on github. Let me see if this is ease to implement.