Now that I am building a few CMS sites I usually insist that people use Firefox and not just because it renders pages better and all the other security reasons but because of the wealth extensions and especially the ones that make using and not necessarily surfing the web really useful.
So here is my list of great firefox extensions that make using any CMS system or blogging app more useful.
Deepest Sender
Why not just build your blogging app into firefox and remove the need to log into your site or sites all the time. I use it all of the time and in fact I only really ever visited the admin section of my wordpress installation to make site changes.
Although it has a limitation in that you cannot directly upload images through the interface this is not usually much of a problem.
Web Developer Toolbar
Quite simply the daddy of extensions, few the CSS of a page, visually debug most of the elements of a page, view cookies and so much more. Essential.
1Passwd
Airoboform for Osx, fills forms and logs passwords.
Firebug
Explore the javascript, CSS and HTML of any page and debug them in a nice way.
GooglePedia
View the relevant (normally) wikipedia article to the phrase or word you search in google. Although be careful hours can be lost.
Copy Plain Text
Allows you to choose to either normally copy the text selected in a page or just to copy the text as unformatted text. Well handy for striping out other peoples old font tags and spans etc.
Dummy ipsum
Helps when you want to see the layout of a page, but have no copy to place in it yet.
Resizeable form field
This is really handy but only in the way that it should be installed by default.
Farkode
Fills in where your CMS system fails by giving you right click access to loads of common HTML tags.
Colt
Should be built in really
Xinha Here
Replaces a normal text area with a good (well not as good as FCKeditor but almost) online wysiwyg editor. Really handy for places like ebay where the editor is not compatible with firefox (why oh why do they not sort this out!! )
There are more, but most are specific to a particular service or website and not really relevant for what I need to do but please comment and update.