IDE Features
Menu Bar
The File menu allows you to create, open, and save test case and test suite files. The Edit menu allows copy, paste, delete, undo, and select all operations for editing the commands in your test case. The Options menu allows the changing of settings. You can set the timeout value for certain commands, add user-defined user extensions to the base set of Selenium commands, and specify the format (language) used when saving your test cases. The Help menu is the standard Firefox Help menu; only one item on this menu–UI-Element Documentation–pertains to Selenium-IDE.
Toolbar
The toolbar contains buttons for controlling the execution of your test cases, including a step feature for debugging your test cases. The right-most button, the one with the red-dot, is the record button.


Speed Control: controls how fast your test case runs.


Run All: Runs the entire test suite when a test suite with multiple test cases is loaded.

Run: Runs the currently selected test. When only a single test is loaded this button and the Run All button have the same effect.


Pause/Resume: Allows stopping and re-starting of a running test case.

Step: Allows you to “step” through a test case by running it one command at a time. Use for debugging test cases.

TestRunner Mode: Allows you to run the test case in a browser loaded with the Selenium-Core TestRunner. The TestRunner is not commonly used now and is likely to be deprecated. This button is for evaluating test cases for backwards compatibility with the TestRunner. Most users will probably not need this button.

Apply Rollup Rules: This advanced feature allows repetitive sequences of Selenium commands to be grouped into a single action. Detailed documentation on rollup rules can be found in the UI-Element Documentation on the Help menu.

Record: Records the user’s browser actions.
Test Case Pane
Your script is displayed in the test case pane. It has two tabs, one for displaying the command and their parameters in a readable “table” format.