Change the location of new tab opened by link from existing tab in Firefox

As of Firefox 3.6.3, the location of new tab opened by link from existing tab, is next to the tab from which it is opened.

TheExistingTab   NewTab   OtherTabOne   OtherTabTwo   OtherTabThree

In Firefox 3.5, the new tab opened by link from existing tab, is at the right of all current tab.

TheExistingTab   OtherTabOne   OtherTabTwo   OtherTabThree   NewTab

How to change the way new tab opened by link from existing tab as Firefox 3.5

Where to download the latest official version of Firefox

Download the latest Firefox official beta: http://www.mozilla.org/en-US/firefox/beta/all/
Download the latest Firefox official stable release: http://www.mozilla.org/en-US/firefox/all/

How to extract omni.ja of Firefox

omni.ja can't be opened with the latest stable version of 7-zip 9.20,
but it can be opened with the latest unstable version of 7-zip 9.32.

Extract omni.ja to omni folder with 7-zip 9.32, ignore the errors during extracting.

How to download YouTube videos by Firefox extension

Via the Firefox extension Download YouTube Videos as MP4
https://addons.mozilla.org/firefox/addon/download-youtube

You can download YouTube videos after installing that Firefox extension.
You click the Download button in the web page of YouTube video, and select the format you wanna download.

How to change the disk cache location of Firefox

In the address bar of Firefox, go to about:cache, remember the Cache Directory under Disk cache device, it's the original default Cache Directory, you may wanna delete it after changing it to a new one.

In the address bar of Firefox, go to about:config, add a new string called browser.cache.disk.parent_directory, if the value of the string is R:\TEMP, the cache of Firefox will be stored in R:\TEMP\Cache

Restart Firefox for the changes to take effect.