Observed behavior in Firefox 26 (Linux Mint Maya):

If code editor is enabled in javascript page (eg: [[:ml:User:Praveenp//common.js]]), edit happens somewhere else than the visible cursor appears.

Observed behavior in Chromium (Version 31.0.1650.63 Built on Ubuntu 12.04, running on LinuxMint 13 (31.0.1650.63-0ubuntu0.12.04.1~20131204.1)):

Editor works as expected sometimes but other occasions, nothing other than backspace works on line 2 onwards. While backspacing cursor does not get updated on each click of backspace button.

After disabling code editor by clicking "/*" page in both browser works normal.

Version: unspecified
Severity: normal