If you want front page radio button in backend of submiting articles be always on front page, then in administrator/components/com_content/controller.php instead of:

$lists['frontpage'] = JHTML::_('select.booleanlist', 'frontpage', '', $row->frontpage); 


if (!$edit) $row->frontpage = 1;
$lists['frontpage'] = JHTML::_('select.booleanlist', 'frontpage', '', $row->frontpage);

Taken from here.

Also, if you want front page radio button in frontend of submiting article be always on front page, then in \components\com_content\views\article\view.html.php instead of:

$article->frontpage = 1;


$article->frontpage = 0;

If you have problems embeding flash into your Joomla! site, try to disable Code cleanup:

Extensions->Plugin Manager->Editor - TinyMCE 2.->Code cleanup on save->Always

If you want your HTML code in the articles to keep clean, to keep your Indentation/Tabs/Space Policy (justification), then in plugins find TinyMCE plugin and set Code Cleanup on Save = Never

If your Joomla! site still have RSS icon in FireFox adress bar, and you want to get rid of it, then in your template search for the code:

<link rel="alternate" type="application/rss+xml" 
title="RSS 2.0" href="http://www.harpervance.com/feeds/ranwillisblog.php" />

And comment it. Taken from here.