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What is the Difference Between Selenium Core Extensions and Selenium IDE Extensions?

Last Updated : 11 Jan, 2024
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Selenium is a popular tool for testing and automating web applications. It has changed over time and has different parts that help users in different ways. The two important parts are Selenium Core (from the past) and Selenium IDE. Both have extensions that add additional features to the tool. This article looks at the differences between Selenium Core extensions and Selenium IDE extensions, explaining what they do, how they are used, and why they are important in the history of Selenium.

Selenium Core

Selenium Core was the initial version of the Selenium automation framework and played a crucial role in the evolution of Selenium. It was a JavaScript-based automation engine that allowed Selenium scripts to interact with web browsers directly. Selenium Core operated by injecting JavaScript code into the browser and executing it to perform actions and retrieve results.

Features of Selenium Core

  1. JavaScript-Powered Automation: Selenium Core was all about harnessing the power of JavaScript to automate browser tasks. Test scripts were crafted in HTML, embedding JavaScript code that Selenium Core would skillfully execute.
  2. Browser Harmony: Selenium Core flexed its muscles in the realm of cross-browser compatibility. It seamlessly worked across various browsers, empowering users to create automation scripts that played well on different browser stages.
  3. The Rise of WebDriver: Although Selenium Core was a pioneer, it hit certain roadblocks as web technologies advanced. Enter Selenium WebDriver, the evolutionary successor that addressed these limitations, providing a robust solution for modern testing scenarios.
  4. Farewell to Selenium Core: As times changed, Selenium Core faced its sunset. It’s been deprecated, and the recommendation is to bid it adieu. Selenium WebDriver takes the spotlight now, setting the standard for Selenium automation with its enhanced architecture and capabilities.

Selenium Core Extensions

In the historical context of Selenium Core, extensions referred to additional functionalities or modules that could be added to enhance the core capabilities of Selenium. These extensions were often JavaScript files that extended the functionality of Selenium Core.

Features of Selenium Core Extensions

  1. Custom Commands: Extensions allowed users to define custom commands that were not part of the core Selenium functionality. These commands could be specific to the requirements of a particular project.
  2. Enhancements and Features: Selenium Core extensions could introduce new features or enhancements to address specific use cases. These features were often aimed at providing more flexibility and control in test automation.
  3. Integration with Other Tools: Extensions could facilitate integration with other testing tools or frameworks. This interoperability was valuable for users who wanted to combine the strengths of Selenium with other technologies.
  4. Community Contributions: The Selenium community actively contributed extensions, sharing them with other users. This collaborative approach allowed Selenium to adapt to diverse testing scenarios and user needs.

Example Use Cases

  1. Custom Logging Extension: An extension might introduce a custom logging mechanism, providing detailed logs of test execution for analysis and debugging purposes.
  2. Data-Driven Testing Extension: An extension could enable data-driven testing by allowing users to parameterize test scripts and run them with different sets of data.
  3. Browser-Specific Extensions: Extensions might be created to address browser-specific issues or to leverage unique features of individual browsers.

Selenium IDE

Selenium IDE, or Integrated Development Environment, is a browser extension that simplifies the process of creating and executing Selenium test scripts. It provides a user-friendly interface for recording, editing, and playback interaction with web applications. Selenium IDE is particularly popular among testers and developers for its easy use and quick script creation capabilities.

Features of Selenium IDE

  1. Recording and Playback: Selenium IDE makes it a breeze to record your moves on a web application. Just click around, do your thing, and Selenium IDE takes note of it all in the form of a script.
  2. Editing Scripts: Tweak and polish your recorded scripts effortlessly. The IDE gives you a simple interface to edit scripts, catering to folks with different levels of tech know-how.
  3. Script Export: Selenium IDE lets you export your recorded scripts in languages like Java, Python, Ruby, and more. This way, you can smoothly slot them into your favourite testing frameworks.
  4. Playback and Debugging: Check if your script is working as expected by playing it back in the Selenium IDE environment. And if something’s off, use the debugging features to figure out and fix the issues.
  5. Cross-Browser Testing: Selenium IDE plays nicely with popular web browsers like Chrome and Firefox, making it a piece of cake to test across different browsers.
  6. Element Identification: Easily spot and handle web elements using various locator strategies like ID, name, CSS selectors, and XPath. It’s like a shortcut for creating and keeping up with your scripts.
  7. Dynamic Waiting: Selenium IDE doesn’t rush things. It waits patiently for elements to load before making a move. This way, your scripts only interact with elements when they’re fully loaded and good to go.

Selenium IDE Extensions

Selenium IDE is a modern tool that works as a browser extension. This makes creating test scripts much easier than in the old Selenium Core. With Selenium IDE, you don’t have to deal with complex scripts – it gives you a simple interface right in your browser. You can record, edit and replay your actions without writing complex code.

Selenium IDE has additional features called extensions or plugins. These are like add-ons that you can install to give Selenium IDE even more capabilities. The community or others outside of Selenium create these extensions to add great features, connections to other tools, or personalized options. They make Selenium IDE even more powerful and flexible.

Purpose of Selenium IDE Extensions

  1. New Commands Integration: Extensions bring in fresh Selenium commands, expanding beyond the standard set in Selenium IDE. These commands are designed to offer users supplementary functionalities, enhancing their testing capabilities.
  2. Seamless Integrations: Selenium IDE extensions can seamlessly integrate with various tools and services. This integration empowers users to seamlessly incorporate Selenium IDE into their existing workflows, fostering a cohesive and efficient testing environment.
  3. Tailored Customization: Extensions provide users with the flexibility to tailor the Selenium IDE environment to meet their specific testing needs. This includes the ability to add custom locators, create user-defined functions, and implement other personalized adjustments, ensuring a testing setup that aligns with unique requirements.
  4. Diverse Export Options: Some extensions introduce additional export formats or options, providing users with an array of choices when working with generated scripts. This added flexibility allows users to adapt scripts to different contexts or tools, enhancing the versatility of Selenium IDE in diverse testing scenarios.

Using Selenium IDE Extensions

  1. Accessing Extensions: To get started with Selenium IDE extensions, after a successful installation, you’ll find easy access via the user interface. Simply navigate to the specified “Extensions” or “Plugins” menu within Selenium IDE. From there, effortlessly integrate the additional functionalities into your testing environment, ensuring a smooth and user-friendly experience.
  2. Enabling and Disabling Extensions: Tailoring your testing experience to meet specific requirements is made simple by enabling or disabling individual extensions. This flexibility empowers users to utilize extensions selectively, ensuring they come into play only when needed, streamlining the testing process.
  3. Configuring Extensions: To enhance user control, certain extensions offer configuration options that can be personalized. This involves specifying settings related to additional commands, integrations, or other functionalities, allowing users to fine-tune the extensions to suit their unique testing needs.
  4. Command Usage: Integrating extensions into Selenium IDE test scripts is a straightforward process. Extensions that introduce novel commands can be seamlessly incorporated into scripts alongside standard Selenium commands. This capability enables users to harness the added functionality effortlessly, expanding the scope of their test scripts.

Selenium Core Extensions Vs Selenium IDE Extensions


Selenium Core Extensions

Selenium IDE Extensions


Associated with the historical Selenium Core

Relevant to the modern Selenium IDE

Automation Engine

Depending on Selenium Core, a JavaScript-based engine

Built on Selenium WebDriver for browser automation


Enhancements to Selenium Core functionalities

Extensions for added features in Selenium IDE


Primarily JavaScript-based extensions

Extensions integrated into the Selenium IDE plugin


Extended Selenium Core commands and features

Added commands, integrations, and customizations

Record and Playback

Not applicable as Selenium Core itself had record/playback capabilities

Supports record/playback of interactions with web applications

Usage of JavaScript

Direct use of JavaScript for automation scripts

JavaScript used for scripting within Selenium IDE

Cross-Browser Support

Provided cross-browser support based on Selenium Core capabilities

Leverages Selenium WebDriver for cross-browser compatibility

Programming Language Support

Limited to JavaScript-based scripting

Supports various programming languages for script export

Lifecycle Stage

Deprecated in favour of Selenium WebDriver

Active and relevant in the Selenium IDE ecosystem

Documentation and Support

Limited documentation and support due to deprecation

Ongoing documentation and support for Selenium IDE extensions

Integration Capabilities

Extensions may not have integrated seamlessly with external tools

Extensions can integrate with other tools and services

User Interface (UI)

Lack of a graphical user interface for managing extensions

Extensions are managed through the Selenium IDE UI


This comparison talks about the differences between Selenium Core Extensions (from the past) and Selenium IDE Extensions. It is important to know that Selenium Core is outdated, and people are advised to switch to Selenium WebDriver. Meanwhile, the Selenium IDE is still in use, and its extensions add additional features.

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