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  • How to install browser extensions in Multilogin X

How to install browser extensions in Multilogin X

Written by Yelena V ( Updated on June 11th, 2025 )

Updated on June 11th, 2025

What browser extensions are for

With browser extensions, you can install tools into your profiles just like in a regular browser. Whether it’s a public extension (like an ad blocker or password manager) or something your team built in-house, you can run it inside any profile.

Why browser extensions are helpful

  • Use your favorite tools: add Chrome or Firefox extensions to boost your workflow
  • Custom workflows: load private or team-built extensions for specialized tasks

How to use browser extensions

Interface method

This method is the same as installing extensions in regular browsers.

  1. Launch your browser profile
  2. Visit Chrome web store if you use Mimic or Firefox browser add-ons page if you use Stealthfox
  3. Choose an extension and click "Add to Chrome" or "Add to Firefox"
  4. You will see the installed extension in the top-right corner of the browser profile window
Chrome web store
Firefox browser add-ons
 
 

Folder method

Mimic

The extensions placed in the mimic folder are available in all Mimic profiles: new and old, regular and quick.

 

Preparing the file (method 1)

  1. Visit Chrome web store and install an extension of your choice
  2. Go to chrome://version/ and check the “Profile path”, for example:
    /Users/username/mlx/profiles/46f57e7c-b80a-371e-9a1e-568cb2830359/391670f2-9c19-4279-9a3b-5a9fcc1f1793/065a29da-a68a-4c56-bf33-3d5019abfe60/Default
  3. Open this path in your file explorer and go to the Extensions folder, where you will see a folder named with an extension ID
  4. Once you open it, you'll see a folder named with an extension version – this is the one that you'll need further (see “Using the file”)

Preparing the file (method 2)

  1. Visit Chrome web store
  2. Choose an extension and copy its ID from the address bar: 
    https://chromewebstore.google.com/detail/extension-name/extension-id
  3. Paste the ID into CRXViewer and select "Download as ZIP"
  4. Extract your ZIP file into a new folder

Note that a .crx file won't work on its own. Instead, you need to have a folder with your extension files, including manifest.json. Each extension must have a separate folder.

Using the file

  1. Go to the mlx folder in your file system:
    1. Windows: C:\Users\%username%\mlx
    2. macOS: /Users/%username%/mlx
    3. Linux: /home/%username%/mlx
  2. Create a new folder called custom_extensions and a folder mimic inside of it
  3. Place your extension folder from step 4 above into the mimic folder

Video tutorial

Your browser does not support HTML5 video.
 
 

Stealthfox

The extensions placed in the stealthfox folder are available only in new Stealthfox profiles, regular and quick.

 

Preparing the file

  1. Visit the Firefox browser add-ons page
  2. Choose your extension and right-click the "Add to Firefox" button, then choose "Save Link As"
  3. An .xpi file will be downloaded to your computer

Using the file

  1. Go to the mlx folder in your file system:
    1. Windows: C:\Users\%username%\mlx
    2. macOS: /Users/%username%/mlx
    3. Linux: /home/%username%/mlx
  2. Create a new folder called custom_extensions and a folder stealthfox inside of it
  3. Place your .xpi file from step 3 above into the stealthfox folder

Video tutorial

Your browser does not support HTML5 video.
 
 
 
 

API method

Mimic

Preparing the file (method 1)

  1. Visit Chrome web store and install an extension of your choice
  2. Go to chrome://version/ and check the “Profile path”, for example:
    /Users/username/mlx/profiles/46f57e7c-b80a-371e-9a1e-568cb2830359/391670f2-9c19-4279-9a3b-5a9fcc1f1793/065a29da-a68a-4c56-bf33-3d5019abfe60/Default
  3. Open this path in your file explorer and go to the Extensions folder, where you will see a folder named with an extension ID
  4. Once you open it, you'll see a folder named with an extension version – this is the one that you'll need further (see “Using the file”)

Preparing the file (method 2)

  1. Visit Chrome web store
  2. Choose an extension and copy its ID from the address bar: 
    https://chromewebstore.google.com/detail/extension-name/extension-id
  3. Paste the ID into CRXViewer and select "Download as ZIP"
  4. Extract your ZIP file into a new folder

Note that a .crx file won't work on its own. Instead, you need to have a folder with your extension files, including manifest.json. Each extension must have a separate folder.

Using the file

  1. Use the endpoint Profile Create or Profile Update
  2. Add the following command-line argument into the fingerprint parameter
"cmd_params": {
               "params": [
                   {
                       "flag": "load-extension",
                       "value": "path-to-extension"
                   }
               ]
           }
  1. Replace path-to-extension with a path to a folder created in step 4 above

Want to install multiple extensions at a time? Add several comma-separated paths to one quote block, for example:
"value": "path-to-extension,path-to-extension2"

 

Example

Here is an example of a Profile Create endpoint that installs an extension. To test it, replace the following parameters with your values:

  • "folder-id"
  • "C:\\Users\\Username\\Downloads\\Extension-folder-name"
{
    "browser_type": "mimic",
    "folder_id": "folder-id",
    "name": "profile-name",
    "os_type": "windows",
    "core_version": 125,
    "parameters": {
        "flags": {
            "audio_masking": "mask",
            "fonts_masking": "natural",
            "geolocation_masking": "natural",
            "geolocation_popup": "block",
            "graphics_masking": "natural",
            "graphics_noise": "natural",
            "localization_masking": "mask",
            "media_devices_masking": "custom",
            "navigator_masking": "custom",
            "ports_masking": "natural",
            "proxy_masking": "disabled",
            "screen_masking": "natural",
            "timezone_masking": "mask",
            "webrtc_masking": "mask"
        },
        "fingerprint": {
            "navigator": {
                "user_agent": "Mozilla/5.0 (Windows NT 11.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.5790.110 Safari/537.36",
                "hardware_concurrency": 4,
                "os_cpu": "windows",
                "platform": "Win32"
            },
            "media_devices": {
                "video_inputs": 1,
                "audio_inputs": 2,
                "audio_outputs": 4
            },
            "cmd_params": {
                "params": [
                    {
                        "flag": "load-extension",
                        "value": "C:\\Users\\Username\\Downloads\\Extension-folder-name"
                    }
                ]
            }
        },
        "storage": {
            "is_local": true,
            "save_service_worker": true
        }
    }
}
 
 

Stealthfox

Preparing the file

  1. Visit the Firefox browser add-ons page
  2. Choose your extension and right-click the "Add to Firefox" button, then choose "Save Link As"
  3. An .xpi file will be downloaded to your computer

Using the file

  1. Use the endpoint Profile Create or Profile Update
  2. Add the following command-line argument into the fingerprint parameter
"cmd_params": {
               "params": [
                   {
                       "flag": "load-extension",
                       "value": "path-to-extension"
                   }
               ]
           }
  1. Replace path-to-extension with a path to a file downloaded in step 3 above

Want to install multiple extensions at a time? Add several comma-separated paths to one quote block, for example:
"value": "path-to-extension,path-to-extension2"

 

Example

Here is an example of a Profile Create endpoint that installs an extension. To test it, replace the following parameters with your values:

  • "folder-id"
  • "C:\\Users\\Username\\Downloads\\Extension-file-name"
{
    "browser_type": "stealthfox",
    "folder_id": "folder-id",
    "name": "profile-name",
    "os_type": "windows",
    "core_version": 126,
    "parameters": {
        "flags": {
            "audio_masking": "mask",
            "fonts_masking": "natural",
            "geolocation_masking": "mask",
            "geolocation_popup": "block",
            "graphics_masking": "natural",
            "graphics_noise": "natural",
            "localization_masking": "mask",
            "media_devices_masking": "custom",
            "navigator_masking": "custom",
            "ports_masking": "natural",
            "proxy_masking": "disabled",
            "screen_masking": "natural",
            "timezone_masking": "mask",
            "webrtc_masking": "mask"
        },
        "fingerprint": {
            "navigator": {
                "user_agent": "Mozilla/5.0 (Windows NT 11.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.5790.110 Safari/537.36",
                "hardware_concurrency": 4,
                "os_cpu": "windows",
                "platform": "Win32"
            },
            "media_devices": {
                "video_inputs": 1,
                "audio_inputs": 2,
                "audio_outputs": 4
            },
            "cmd_params": {
                "params": [
                    {
                        "flag": "load-extension",
                        "value": "C:\\Users\\Username\\Downloads\\Extension-file-name"
                    }
                ]
            }
        },
        "storage": {
            "is_local": true,
            "save_service_worker": true
        }
    }
}
 
 
 
 

Pro tips

  • Install tools like Grammarly, LastPass, or ad blockers to make work easier
  • Test automation scripts or cookie managers by adding them as extensions
  • Keep your custom extensions updated by re-uploading them if changes are made

FAQs

Can I install multiple extensions?

Yup – just make sure they don’t conflict with each other.

Will the extensions stay after I close the profile?

Yes, extensions stay saved to that profile until you remove them.

Are extensions shared across profiles?

Nope – each profile has its own set. Super helpful for keeping things separate.

extension installation custom plugins install extension browser addons install browser extension

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In this article

  • What browser extensions are for
  • Why browser extensions are helpful
  • How to use browser extensions
  • Pro tips
  • FAQs
  • Can I install multiple extensions?
  • Will the extensions stay after I close the profile?
  • Are extensions shared across profiles?

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  • ANTIDETECT PLATFORM

    • Antidetect browser
    • Mobile antidetect browser
    • Headless browser
    • Multilogin residential proxies
    • Multi-account management
    • Web automation
  • RESOURCES

    • Knowledge base
    • API documentation
    • Glossary
    • Blog
    • Multilogin 6 download
    • Server status
    • Release notes
  • MULTI-ACCOUNT MANAGEMENT

    • Create multiple Facebook accounts
    • Create multiple LinkedIn accounts
    • Create multiple Amazon accounts
    • Create multiple eBay accounts
    • Create multiple Gmail accounts
    • Create multiple Discord accounts
  • COMPARISON

    • Multilogin vs. Gologin
    • Multilogin vs. Adspower
    • Multilogin vs. Dolphin Anty
    • Multilogin vs. Incognition
    • Multilogin vs. Octo Browser
  • PLATFORM PROXIES

    • Google proxy
    • Facebook proxy
    • Reddit proxy
    • Twitter proxy
    • Amazon proxy
    • LinkedIn proxy
  • GEO PROXIES

    • Japan proxy
    • UK proxy
    • USA proxy
    • China proxy
    • Canada proxy
    • India proxy
  • GET IN TOUCH

    • 24/7 support: [email protected]
    • Contact sales
    • Affiliate program
    • Careers
Multilogin abstract watermark
  • Privacy policy
  • Terms of service
  • Cookie policy

© 2025 Multilogin. All rights reserved.

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