Selenium IDE (Integrated Development Environment) primarily supports the following browsers:

1. Mozilla Firefox: Selenium IDE started as a Firefox extension and has been primarily associated with Firefox for a long time.

2. Google Chrome: More recently, Selenium IDE has been made available as a Chrome extension, allowing tests to be recorded and played back in Chrome.

These browser extensions for Selenium IDE provide a user-friendly interface to create, edit, and debug Selenium test cases and test suites. The tests are created using a record-and-playback approach, making it easier for users without extensive programming knowledge to create automated tests for web applications.

Key Features of Selenium IDE

• Record and Playback: Users can record user interactions with a web application and play them back to execute tests.
• Selenese Commands: Provides a set of commands for performing various actions like clicking a link, selecting an option from a dropdown, etc.
• Export Tests: Tests can be exported in various programming languages like Java, C#, Python, etc., for use with Selenium WebDriver.
• Debugging and Test Suites: Offers features for debugging tests and organizing multiple tests into test suites.

Limitations

• Limited to Web Browsers: Selenium IDE is limited to the web browsers it supports, primarily Firefox and Chrome. It does not support other browsers like Safari, Internet Explorer, or Edge directly.
• Limited Functionality: While Selenium IDE is great for simple tests, it may not be suitable for more complex test scenarios that require conditional logic, loops, or extensive data-driven testing. For these, Selenium WebDriver with a programming language is recommended.