Selenium IDE is a Firefox add-on that allows users to record, edit, debug, and play back tests captured in the Selenese format, which was introduced in the Selenium Core version. It also provides us with the ability to convert these tests into the Selenium RC or Selenium WebDriver format. We can use Selenium IDE to do the following:

• Create quick and simple scripts using record and replay, or use them in exploratory testing
• Create scripts to aid in automation-aided exploratory testing
• Create macros to perform repetitive tasks on Web pages

The Selenium IDE for Firefox stopped working after the Firefox 55 moved to the WebExtension format from XPI format and it is currently no longer maintained.