Difference between Performance, Load and Stress Testing

NO	Performance Testing	Load Testing	Stress Testing
1	It is testing to determine how the system perform in given particular situation	It is testing to determine the behavior of the system under a specific expected load	It is testing to determine the behavior of the system after increasing upper limit within system
2	The Main goal of the Performance testing to find out the accuracy and close monitoring of the performance and result	The main goal of the Load testing to find the defect in application like memory leak, buffer overflow etc.	The main goal of the stress testing in to analyze the post crash reports to define behavior of the application after specific failure
3	-	Load Testing also called as Volume testing and Endurance Testing	Stress testing is also Known as Fatigue testing
4	Performance testing  check that how fast the Application is?	Load testing  check that  how much volume can be application process?	Stress testing is check how Application recover gracefully after crashes/Stress?

Firefox Add-on: Use for Testing

1.Firebug :

• Firebug the most popular and powerful web development tool .
• You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
• It is helpful in Functional testing.

2.FireFTP:

• FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.
• Created by Mime Čuvalo as an add-on for Firefox, it was adapted to BlueGriffon.

3.iMacros :

• Automate the Firefox.
• Using iMacros  you can do repetition task like visiting the same sites every days, filling out forms, and remembering passwords by doing Record and replay.
• Using iMacros can do regression testing,functional testing & performance testing of web application.

4.Live HTTP Headers :

• It check http communications with redirects url, GET and POST data.

5.YSlow:

• YSlow analyzes web pages and why they're slow based on Yahoo!'s rules for high performance web sites.

6. LinkChecker:

•  Check the validity of links on any webpage.

 7.Font Finder:

• It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

8.Tamper Data:

• Tamper Data allows you to view and modify HTTP/HTTPS headers and post parameters.
• You can use it to test security of your web applications by modifying POST data and analyzing how your application will respond to those changes.

9. MeasureIT:

• It’s used in incoming measuring the element dimensions in pixels