There are hundreds of tricks for Firefox that you can apply to tweak, optimize, change UI and mostly to increase browsing speed. But while browsing I landed on a webpage where I found these cool and probably unknown tricks that are somehow useful as well.
To apply and check these tricks you have to open a new window and copy-paste the code in address bar of your Firefox browser.
1. Make Firefox Dance.
Top ten Tricks of FireFox Browser
chrome://global/content/alerts/alert.xul
It makes the Firefox window auto collapse and expand in the corner of your monitor screen.
2. Open Firefox inside Firefox.
chrome://browser/content/browser.xul
This opens another Firefox inside a tab in the the existing Firefox window.
3. Options inside a Tab
chrome://browser/content/preferences/preferences.xul
This opens the Options dialog box inside the Firefox tab. See the screenshot above.
4. Bookmarks Manager inside tab.
chrome://browser/content/bookmarks/bookmarksPanel.xul
Opens the “BookMarks Manager” inside a tab in the Firefox window.
5. History inside
chrome://browser/content/history/history-panel.xul
Opens the History Panel inside the Firefox tab.
6. See the Extensions in a tab.
chrome://mozapps/content/extensions/extensions.xul?type=extensions
Opens the Extensions window in the current tab.
7. Manage installed cookies in a tab window.
chrome://browser/content/preferences/cookies.xul
This opens the “cookies window” inside a tab.
8. Clear Private Data and History
chrome://browser/content/preferences/sanitize.xul
Opens the “Clear Private Data” window inside the current tab.
9. Sliding Developers’ Credits
chrome://browser/content/credits.xhtml
A scrolling list of names of those who created the Best Web Browser for us 
10. About Firefox in a tab.
chrome://browser/content/aboutDialog.xul
Opens the “About Firefox” Dialog box inside the tab.
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