While working with Firebug's Console or Firefox's Web Console, you have to constantly keep switching focus from the web page to the respective command line and back, using the mouse. This gets very repetitive and tiring, real fast. If you are like me, then you have probably figured that (thankfully) there are keyboard shortcuts to focus the command lines of the respective consoles.
Switch to the respective consoles
In case you didn't know the shortcut keys, here they are:
For Firebug's Console, the key combination is
Ctrl + Shift + L
For Firefox's Web Console, the key combination is
Ctrl + Shift + K
Note: In the present stable version of Firefox (Firefox 27), the above key combination toggles the Firefox Web Console. In future versions of Firefox — probably starting from Firefox 30 — the behaviour will change to: always focus the command line (similar to the current behaviour of Firebug). Reference: https://bugzilla.mozilla.org/show_bug.cgi?id=612253
Now that we are able to focus the command lines of the respective consoles, another problem arises.