Hi
(now editing my original question:)
I know this is an old thread and most interest is around newer broswers, tho i'm new to PW and needing ie8 support hence liking this theme a lot. oneproblem is it displays differently across firefox (41) - navbar inline as expected - compared with chrome (45) and ie8-11 - navbar right and search navbar-form both sit underneath the navbar-brand and the search form is ?page width. reproduced this on 2 machines.
borrowing from the bootstrap docs one fix is replacing the <form> code in site/templates/head.inc line 67... to this:
<form class="navbar-form navbar-right" role="form" id='search_form' action='<?php echo $config->urls->root?>search/' method='get' >
<span class="form-group form-inline">
<input type='text' name='q' id='search_query' class="form-control" value='<?php echo htmlentities($input->whitelist('q'), ENT_QUOTES, 'UTF-8'); ?>' />
<button type='submit' id='search_submit' class="btn btn-default"><!--span class="glyphicon glyphicon-search"></span-->Search</button>
</span>
</form>