<div is="leftmenus" class="container"> should be <div id="leftmenus" class="container">
Created attachment 6333 [details] [review] Bug 7242 : Fixing typo in a div
Trivial change to template; signed off and QA'ed in one.
Patch pushed, please test. Chris_n => This is a so tiny patch that I haven't pushed it in a separate branch, but directly onto master. Is it a problem for you if I do so for small/typo patches?
Included in the 3.6 branch prior to 3.6.4.