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Enable inspector:
For Firefox 4, Mozilla worked on an inbuilt inspect feature quite similar to the one found in Chrome, and Opera, and available for Firefox with FireBug. The UI for this feature is not very polished, but it does the job well enough. If all you need to do is inspect the source code and CSS styling information for elements on the page, without changing anything, this might be adequate. The enable the feature:
· Go to the about:config page by entering it in your location bar and agreeing with the warning.
· Enter inspector in the filter area.
· Now double-click on the devtools.inspector.enabled entry.
· Restart Firefox.
Now you will find a new entry “Inspect” under the Web Developer” sub-menu in the Firefox button. You can also find it in the tools menu if you have the menu enabled, or you can toggle it with [Ctrl] + [Shift] + [I].
The feature wasn’t completed and is not enabled by default. It works well enough but can be quite buggy, so beware before enabling it.Get back the RSS subscription button:
If you are a heavy RSS/Atom feeds user you might have been disappointed by Mozilla’s decision to remove the RSS button from the address bar. The good news is that the functionality is still there, albeit further away under the bookmark menu.
A better option is to add back the RSS button to the navigation bar. To do so, right click on the Firefox button, and under Options click on “Toolbar Layout…”. This will open a dialog that has a number of widgets that can be added to the add-on bar or the navigation bar. There will be a button labeled “Subscribe”. Drag this to the add-on bar, navigation bar or even the tab bar and menu bar!
You can now click on this button to get the same functionality as the RSS button in the Firefox 3 address bar offered.