You can usually inspect the files Chrome runs for an extension, but those files are not necessarily the developer’s original, readable source project. The best options are to find the developer’s official repository or copy the extension’s installed package from your Chrome profile. A CRX or ZIP can also be extracted if you already have a legitimate package.
Keep the distinction in mind: a package may contain minified or bundled JavaScript, omit the project’s build files and comments, and rely on a remote service whose server-side code is not included.
What “source code” can mean
Before choosing a method, decide which material you need. An extension’s original source repository, published package, installed files, and live behavior are related but not interchangeable.
| What you want | What it contains | Best route |
|---|---|---|
| Original source repository | Potentially readable source, build configuration, history, tests, and license information. | Find the developer’s official repository. |
| Published package | The files distributed to Chrome, commonly including a manifest, scripts, pages, styles, and assets. | Copy the installed extension or extract a package you have. |
| Runtime behavior | What the extension does while active, including interactions among scripts and network requests. | Inspect its contexts with Chrome DevTools. |
| Remote backend | Code running on the developer’s server rather than in the browser package. | It cannot be recovered from the extension files. |
Chrome requires an extension’s manifest.json at the package root; it describes the extension’s structure and behavior. The current Chrome manifest reference documents Manifest V3: Chrome’s manifest file format.
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Find the developer’s official repository first
An official repository is the best route if you want the project as the developer maintains it, rather than only the production files Chrome runs.
- Open the extension’s Chrome Web Store listing and check its developer, website, support, and privacy-policy links.
- On the developer’s site or in the extension’s description, look for “Source code,” “Repository,” “GitHub,” “GitLab,” “Contributing,” or “License.” You can also check the extension’s options or about page.
- Confirm that the repository belongs to the same developer. Compare its manifest, extension name, ID, or release notes with the extension you have.
- If the project uses a build process, check whether the repository includes generated release files or instructions for building the extension.
A repository can be old, incomplete, or unrelated to the installed release, so compare versions rather than assuming a matching name is proof. The Chrome Web Store’s privacy disclosures and Manifest V3 rules do not require every developer to publish an original source repository. Its code requirements address what extensions may run and submit, not a general obligation to release source: Chrome Web Store Manifest V3 requirements and Chrome Web Store Program Policies.
Copy an extension that is already installed
For an installed extension, copying its local directory is often the most dependable way to inspect the exact package present on that computer. Work from a separate copy; do not edit Chrome’s live installation directory.
- In Chrome, open
chrome://extensions, turn on Developer mode, and locate the extension. - Record the extension ID shown on its card and, if useful, the displayed version.
- Open
chrome://versionand find Profile Path. This is the profile to inspect; do not assume Chrome uses its default profile directory. - Close Chrome before copying, or at least avoid copying while it is updating the extension.
- In the profile, open
Extensions/<extension-id>/. Copy the version-numbered directory to a separate working folder.
A typical layout is <Chrome profile>/Extensions/<extension-id>/<version>/. More than one version directory may be present. Preserve separate copies if you want to compare them; an installed copy represents the version on the machine at the time you copied it, not necessarily the current Store release or an older version you remember.
Common default profile paths
These are examples, not authoritative locations. The profile may have another name, be relocated, or belong to a different Chromium-based browser or operating-system user. Use the exact path from chrome://version whenever possible.
- Windows:
%LOCALAPPDATA%GoogleChromeUser DataDefault - macOS:
~/Library/Application Support/Google/Chrome/Default - Linux:
~/.config/google-chrome/Default
Optional copy commands
Replace the placeholders with the path, ID, and version for your installation. The profile path and profile name may differ from these examples.
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Windows PowerShell:
$source = "$env:LOCALAPPDATAGoogleChromeUser DataDefaultExtensions<EXTENSION_ID><VERSION>"
$destination = "$HOMEDesktopextension-copy"
Copy-Item $source $destination -RecursemacOS or Linux:
cp -R "/path/to/Chrome/Profile/Extensions/<EXTENSION_ID>/<VERSION>"
"$HOME/extension-copy"The copied package may contain manifest.json, service-worker scripts, content scripts, popup or options pages, CSS, images, localization files, bundled libraries, and binary assets such as WebAssembly. A source map may be present, but it is not guaranteed.
If you cannot find the folder
Check that you have the right extension ID and the right browser profile first. The extension might be in Chrome Beta, Dev, Canary, Chromium, or another browser; it may be managed by an administrator, have been removed or updated, or belong to another operating-system user.
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chrome://version. - Confirm the ID on
chrome://extensions. - Check the browser variant, Chrome profile name, and operating-system user account.
- Search within the correct profile for the ID; do not rely on a default path if Chrome reports another location.
Extract a CRX or ZIP you already have
A CRX is a packaged extension format; a ZIP may contain the same kind of files in an ordinary archive. Make a copy of the package before working on it. You do not need to install an unknown extension merely to inspect its contents.
For a CRX file
- Keep an untouched backup of the
.crxfile. - Try opening the copy with a trusted archive utility. If it does not recognize the file, use a trusted extension-specific unpacking workflow.
- Extract into a new directory and look for
manifest.json. - Open the extracted files with a code or text editor.
Renaming .crx to .zip is not a guaranteed extraction method: packaging versions and archive layouts can differ. Chrome’s development documentation covers packing an extension into CRX and PEM files: Permission warning guidelines.
For a ZIP file
- Copy the ZIP and extract it into a new folder.
- Find the directory that directly contains
manifest.json. - Open that manifest and the scripts and pages it references.
If the archive has an outer wrapper folder and manifest.json is one level deeper, the nested directory is the extension root.
Inspect the manifest, permissions, and files
Start with manifest.json. It points to important pieces such as the background service worker, content scripts, popup, and options page, and lists permissions the extension requests. Check both permissions and host_permissions; the Chrome guide explains permission declarations and access behavior: Declare permissions.
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On chrome://extensions, select Details for the extension to review available information and controls, including site access, permissions, incognito access, file-URL access, and the extension ID. File-URL or incognito access may require separate user approval. The page helps identify and manage an extension; it is not a general source-code download feature.
Static inspection checklist
- Read the manifest’s permissions, host permissions, content-script matches, service-worker entry, and referenced pages.
- Search JavaScript for
fetch(,XMLHttpRequest,WebSocket, and URLs or domain names to locate network communication. - Search for APIs and data stores such as
chrome.storage,chrome.cookies,chrome.tabs,chrome.scripting,chrome.webRequest,document.cookie, andlocalStorage. - Search for dynamic-code patterns such as
eval(andnew Function(, then examine their context rather than treating a match alone as proof of malicious behavior. - Review HTML for inline scripts and external resources, and check whether
.mapsource-map files are included. - Keep a note of the package version and file set if you need to compare copies later.
Manifest V3 restricts remotely hosted executable code under Chrome Web Store policy, but that does not make an extension automatically easy to read or guarantee that its behavior is obvious from its files. Bundling and minification remain common, and server-side behavior is outside the package. See Chrome’s Manifest V3 requirements.
Inspect live behavior with Chrome DevTools
Static files do not always reveal when a script runs or how an extension’s parts interact. Depending on the extension, chrome://extensions may show an inspection link for a popup or background service worker. You can also inspect the popup or options page when it is open and use the relevant page’s DevTools to examine its console, sources, and network activity. Content scripts run in the context of pages they match, so inspect a page where the extension is active if you are investigating those scripts.
Runtime inspection can help when a script runs only after a user action, generated chunks obscure the code, or network requests matter to the question. It shows a running context and state; it does not reconstruct a complete original source tree or expose the code on the extension’s server.
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Loading an unpacked folder is useful for testing changes, not a safe way to run arbitrary code. Only load code you trust, and never modify the installed original.
- Copy the extension directory to a separate working folder and make changes only there.
- Open
chrome://extensionsand enable Developer mode. - Click Load unpacked and select the directory that directly contains
manifest.json. - If Chrome reports a problem, open the extension’s Errors panel and address the manifest or missing-file error.
- After changing files, click the extension card’s reload button to load the updated copy.
This is Google’s documented Developer mode → Load unpacked workflow for extension folders: Google Chrome Enterprise Help. Google describes unpacked extensions as intended for trusted development code: Distribute your extension.
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Why a copied extension may fail
- The selected directory does not directly contain a valid
manifest.json, or the manifest references files that are missing. - The extension relies on a build step, unsupported manifest keys, or behavior tied to its published extension ID.
- OAuth redirect URLs or API credentials may be restricted to that ID; a service may also reject an old version or expect Store update behavior.
- A feature may require a particular site, secure origin, permission, or external server.
- Enterprise policy or the browser may block Developer mode or unpacked extensions.
Loading a copied directory does not guarantee it can be reinstalled or behave like the Store-installed extension. Installation and self-hosting rules vary by platform and management status. See Chrome’s alternative installation methods; Linux has separate hosting details at Self-host for Linux.
If the extension was removed or updated
Check sources in this order: a developer-owned repository or release archive, a backup of the installed directory, an organization’s managed deployment package, or a CRX or ZIP you saved earlier. If the extension is still installed, copying its local directory is generally more dependable than relying on an unknown third-party download site, which may provide a stale, altered, malicious, or misidentified package.
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Understand what you can—and cannot—recover
Minified, bundled, or obfuscated files
Production JavaScript may have shortened names, combined modules, or undergone obfuscation. That is why a package can be inspectable without being pleasant to read. Try a formatter in a code editor, search for API calls and domain names, inspect the relevant runtime context, and look for source maps or an official repository. Formatting improves layout; it does not restore omitted comments, original names, project structure, or build history.
Remote services and hidden dependencies
An extension can call a remote service whose implementation is not included in its package. Static inspection may show the destination and request code, but it cannot reveal the server’s private implementation. Similarly, the browser package does not necessarily include development dependencies or files removed during the production build.
Inspection is not reuse permission
Being able to copy or read package files does not automatically grant the right to modify, redistribute, sell, or incorporate them into another project. Check the package or repository license and seek permission where needed; copyright, trademark, privacy, and contractual rules may also matter. Treat the extracted JavaScript as executable code, and do not upload proprietary packages to online unpacking services.
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Choose a method by your goal
| Goal | Best method |
|---|---|
| Read the developer’s original project | Find and verify the official repository. |
| Inspect an extension installed on your computer | Copy its local version directory using the profile path from chrome://version. |
| Inspect a package file you already have | Extract the CRX or ZIP into a separate directory. |
| Review permissions quickly | Use chrome://extensions and read manifest.json. |
| Investigate behavior while running | Inspect its available popup, service-worker, options-page, or content-script contexts with DevTools. |
| Test a modified copy | Use Developer mode → Load unpacked on trusted code. |
| Compare versions | Keep separate copies of the version directories and compare their files. |
Handle unknown extensions cautiously
- Do not install an unknown extension merely to extract it.
- Review its manifest and permissions before loading an unpacked copy.
- For suspicious code, use a separate browser profile or disposable virtual machine, and avoid signing into sensitive accounts while testing.
- Preserve an untouched package copy before making changes.
- Do not treat Developer mode as a way around Chrome’s security controls or organizational policy.
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