Firebug 1.8 b3 has been released. 11 issues has been fixed in this version. major issues were:
- Event Handlers execute javascript function inline.
- Watch panel is invisible on mouseover on breakpoints.
New feature console.timestamp has been introduced in firebug 1.8b3. This feature is used to know the execution of javascript and compare with HTTP traffic timing.

Note: Firebug 1.8 b3 is compatible with Firefox 4 and 5 version.