AdiIRC

The url does not end with ' though it ends with '], if it ended with just ' it would work.

mirc seems to checks if the url begins with a ', then finds the last ', it then checks a list of "allow these characters to be trimmed at end" for each following character, if one character is not on the list, the ' is included.

The list is not transparent, but it does include ] which is why this works in mirc.

I'll try figure out the list at some point and whether if I want to follow it.

On version 3.9 beta, this bug still exists. Just delete the 'at the end of the url as a "trim ()" will do