Using Firefox, first, download the IDE from the SeleniumHQ downloads page Firefox will protect you from installing addons from unfamiliar locations, so you will need to click ‘Allow’ to proceed with the installation
After which -
- Select Install Now. The Firefox Add-ons window pops up, first showing a progress bar, and when the download is complete.
- Restart Firefox.
- After Firefox reboots you will find the Selenium-IDE listed under the Firefox Tools menu.