> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tenderly.co/llms.txt
> Use this file to discover all available pages before exploring further.

# Dev Toolkit Browser Extension

> Dev Toolkit browser extension gives one-click access to Tenderly debugging tools on any block explorer to analyze on-chain data.

Tenderly Dev Toolkit is a browser extension that gives you one-click access to Tenderly’s powerful exploration and debugging tools on any block explorer. Open any transaction in the Tenderly Dashboard to explore, analyze, and debug on-chain data in a human-readable format.

<iframe src="https://www.youtube.com/embed/CMUhjgIJi08?si=RsJYkxe9QzXH7E1Y" title="YouTube video player" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" style={{ aspectRatio: 16 / 9, width: '100%' }} referrerpolicy="strict-origin-when-cross-origin" allowfullscreen />

Once you install the extension, you can access Virtual Environments, Debugger, Simulator, Gas Profiler, and other functionalities from a toolbar on any block explorer.

Download the extension from the Chrome store here:

<Card title="Dev Toolkit Browser Extensionn" href="" />

## Using Tenderly Dev Toolkit

Use Tenderly Dev Toolkit in your everyday workflows to speed up on-chain exploration and debugging. Open any transaction in Tenderly to use the following functionalities:

* **Run on Virtual Environment:** Execute any transaction in a new [Virtual Environment](/virtual-environments/overview) synced with the latest mainnet state to run further tests and experiments.
* **Simulate:** [Simulate successful or failed transactions](/simulator-ui/overview) with updated inputs, parameters, and contract code to preview their execution and expected outcomes.
* **Debug:** Use a [trace-by-trace Debugger](/debugger/overview) to identify where and why an error occurred and edit the contract code to try out a fix right away.
* **View trace:** [Inspect transaction execution](/developer-explorer/inspect-transaction/overview) using the most detailed, searchable stack trace displaying opcodes, event logs, storage variables, and gas usage.
* **View state changes:** [Analyze state changes](/developer-explorer/inspect-transaction/overview#state-changes) that happened during transaction execution, analyzing events and variables in both decoded and raw format.
* **View gas usage:** Get a [granular breakdown of gas usage](/debugger/gas-profiler) per individual function call and optimize code to save valuable resources.