How do I browse /tmp in Finder? I can use the command line to :-

cd /tmp
ls -al


What is the equivalent to do so in finder?
I can't seems find a way to browse to that folder using finder,
(my intention is to view images which I created in /tmp)

Or is there any image browser tools can do the same?
You can use the menu Go -> Go to folder and enter the path of the folder you wish to see in the resulting dialog. 

You can also use the keyboard shortcut Shift + Cmd + G to summon the dialog.