The latest versions of Firebug in Firefox feel like they've been regressing. Performance is abysmal. This is a common complaint amongs everyone on my team, and increasingly among many other web developers online.
Are there any alternative extensions for Firefox that gives similar functionality(DOM inspector, Net tab, console)?
Firefox now has built in developer tools similar to Firebug, but not so full-featured:
https://www.mozilla.org/en-US/firefox/technology/
http://www.webmonkey.com/2011/12/an-overview-of-firefoxs-coming-developer-tools/