what are the best tools to setup VM or Virtual Machines to test automation testing scripts

There are many tools available but these are some of the famous tool

We have two types of VMs

1) Cloud based
2) On local machine

1) Cloud based
Windows azure server it is cloud based you can open this VM from any where can work on cloud.

For linux based we have
FUJITSU and Amazon web services, and also Sauce labs provides cloud based VM's with different set of Browsers.


2) On local machine
Most Famous  ones are

Virtualbox this is Oracle based product.
Vmware
And window will provide some images  by using those images we can setup different OS of Windows.

How to install svn or subclipse on eclipse

http://www.mkyong.com/eclipse/how-to-enable-subversion-svn-in-eclipse-ide/

You can get details here

why firebug icon is not appearing on firefox

If you use older firefox it won't appear . So that you have to install latest version of Firefox.

To trouble shoot firebug use this link.

https://addons.mozilla.org/en-US/firefox/addon/firebug/

To fix this problem ... First download latest version of Firefox

http://www.mozilla.org/en-US/firefox/new/

After that download fire bug

https://addons.mozilla.org/en-US/firefox/addon/firebug/

After that download firepath

https://addons.mozilla.org/en-us/firefox/addon/firepath/