People seem to like posting their favorite plugins and software these days, so I thought I could add my little list of useful stuff here, too. I’m open to suggestions for other good extensions, of course. Here’s my list of Firefox AddOns I am using actively: Adblock Plus Firebug A powerful debugging aid for web developers. Comes with e.g. a DOM explorer and a JavaScript debugger. Web Developer Toolbar A toolbar which offers many useful functions for web developers. In particular, I like outlining of block elements or enabling read-only form fields. FoxyProxy Manage proxy configurations and use them depending on URL patterns etc. ImageZoom Zoom images with RMB and mouse wheel. Foxmarks Synchronizes bookmarks. I found it particularly useful to define synchronization profiles so that I can separate work bookmarks from private stuff. Tabinta Ever tried to enter a TAB in textarea controls? Tabinta allows you to use TAB there. Flagfox Shows the country flag of the server’s origin in the address bar. Split Browser Splits the browser window into multiple areas. Nuke Anything …