Change Default Firefox Shortcut Next Tab & Previous Tab

Why?

The default shortcut for navigating opened tab in Firefox isn’t friendly enough for me, as Thinkpad user, since its Page Up and Page Down on the keyboard is “far” enough for my finger to reach.
As a ‘loyal’ KDE user, I feel comfort already with Konsole’s default shortcut for navigating Tab, that’s by using Shift+Left Arrow/Right Arrow.

What’s next?

Googling around, I found keyconfig, a Firefox extension to change keyboard shortcut (What the.. I‘ve just noticed that Firefox does not have a menu to configure keyboard shortcuts.).

So,the installation on Slackware64-current with Firefox 10.0.2 ran smoothly, but this is not the end yet. By default, keyconfig doesn’t have a shortcut key for tab navigation. So we have to create it manually. Ask Google once more, and voila, I found it:

Add this code to change to next Tab:

gBrowser.mTabContainer.advanceSelectedTab(1,true);

and this one to change to previous Tab:

gBrowser.mTabContainer.advanceSelectedTab(-1,true);