Gajim can not open URLs containing a comma ',' character
Here is an example URL from the conversation history, which causes problems in Gajim:
[20:20:27] User: http://wyborcza.pl/biznes/1,99154,6814199,Jak_nie_kupowac_funduszu_w_worku.html
Clicking on this link we get the following in the browser address bar (Firefox):
http://wyborcza.pl/biznes/1%2C99154%2C6814199%2CJak_nie_kupowac_funduszu_w_worku.html
The result is of course "Page not found".