I had already downloaded and installed Flash for Firefox, following these instructions but could not get it to work as a plugin on Chromium.

Success is yours when you type "about:plugins" into the location bar of Chromium and the Flash player appears.

Fortunately, it turned out to be pretty simple to just link Firefox's plugin into Chromium: As root, do this:

cd /usr/lib64/chromium-browser/plugins/
ln -s /usr/lib64/mozilla/plugins-wrapped/nswrapper_32_64.libflashplayer.so .

Firebug 1.6, the plugin for Firefox, is newly released; for debugging or developing web apps, like Wordpress, it is simply indispensable.

A few of my favorite features:

1. Scrollable breadcrumbs, solves the one biggest thing that always drove me nuts, in dealing with Real World css.

2. Copy CSS from the inspection window by right-clicking on the declaration: