The official blog of the Firebug Firefox extension, announcing releases and compatibility changes for the web debugging tool.
HN links it for release and compatibility notes, and for the announcement that Firebug is being merged into Firefox's built-in developer tools.
Yes. Last spring Firebug rewrote its script debugging tools on top of the new JS debugging APIs in the then-upcoming FF nightlies[1][2]. Firebug was painfully slow for me on JS-heavy sites about a year ago. This year it's perfectly responsive, on the same computer.
[1] https://blog.getfirebug.com/2014/03/26/firebug-2-0-alpha-1/
[2] https://blog.getfirebug.com/2014/06/10/firebug-2-0/
PSA: The Firebug you know (version 2) is incompatible to e10s and there will be no e10s-compatible Firebug 3. Instead, Firebug.next is built-into Firefox(!):
https://blog.getfirebug.com/2016/06/07/unifying-firebug-firefox-devtools/
Firebug is aiming for full functionality on other browsers in the future. Sadly not ready yet :) http://blog.getfirebug.com/2010/10/24/firebug-metamorphosis/
The latest Firebug claims to be compatible with FF5 and 6:
http://blog.getfirebug.com/2011/08/10/firebug-1-8-1/
You should try updating all your addons.
The next generation Firebug will be built on top of the native dev tools, https://blog.getfirebug.com/2014/11/10/firebug-3-next-generation-of-firebug/
Just thought I'd mention that Firebug 1.8 (now in beta) is compatible with Aurora and Nightly:
http://blog.getfirebug.com/2011/07/18/firebug-1-8b6/