Microsoft Edge displays a security warning popup for extensions loaded in Developer Mode (used for unpacked or sideloaded extensions) to discourage potential risks. Officially, Microsoft states this cannot be disabled as it's a built-in security feature. However, there are unofficial workarounds to suppress the prompt permanently or indefinitely. These involve editing browser files, using third-party tools, or switching browser channels—proceed at your own risk, as they may void support, introduce instability, or require admin privileges. Always back up your data first.

The Developer Mode warning does not appear in Microsoft's preview channels like Edge Dev or Canary (Beta still shows it). This is a clean switch without altering files.

  1. Download and install Edge Dev or Canary from the official Microsoft Edge Insider page: microsoftedgeinsider.com/en-us/download.
  2. To migrate your data (bookmarks, extensions, etc.) from stable Edge:
    • Close all Edge instances.
    • Copy the folder %userprofile%\AppData\Local\Microsoft\Edge\User Data\ to %userprofile%\AppData\Local\Microsoft\Edge Dev\User Data\ (adjust "Edge Dev" if using Canary).
  3. Launch the new channel, enable Developer Mode via edge://extensions/ (or msedge://extensions/), and load your extensions. The warning won't trigger.

This works as of recent versions and keeps your stable Edge intact alongside the preview.

Method 2: Modify the Preferences File (Manual Edit, May Be Patched in Newer Versions)

This snoozes the warning until a distant future date by editing Edge's local preferences. It's simple but reportedly patched in some recent dev builds—test it first.

  1. Close all Edge instances completely (check Task Manager for msedge.exe processes).
  2. Navigate to your Edge user data folder: %userprofile%\AppData\Local\Microsoft\Edge\User Data\Default\.
  3. Open the Preferences file in a text editor like Notepad (run as admin if needed). It's a JSON file—make a backup copy first.
  4. Search for the line containing "developer_mode":true (or similar in the extensions section).
  5. Add or modify the entry to include a far-future snooze timestamp, e.g.:
    "dev_mode_warning_snooze_end_time": "99999999999000000",
    
    Example context:
    {"allow_chrome_webstore":true,"dev_mode_warning_snooze_end_time":"99999999999000000","developer_mode":true}
    
    (The timestamp value pushes the next prompt to around the year 4769.)
  6. Save the file and relaunch Edge. Enable Developer Mode if not already on, and load your extensions.

If the edit doesn't persist or the warning returns, the method may be outdated for your version—try Method 1 or 3 instead.

Method 3: Use the Chrome Developer Mode Extension Warning Patcher (Automated Tool)

This open-source tool patches Edge's binaries to remove the warning (and other related popups) at a low level. It's compatible with Edge on Windows 7–11 (x64) and auto-updates its patches.

  1. Download the latest release executable (ChromeDevExtWarningPatcher.exe) from the GitHub releases page: github.com/Ceiridge/Chrome-Developer-Mode-Extension-Warning-Patcher/releases.
  2. If you don't have it, install the .NET 6 Desktop Runtime from: dotnet.microsoft.com/download/dotnet/6.0.
  3. Right-click the executable and run as Administrator. It launches a GUI that auto-detects and patches your Edge installation (no further input needed).
  4. (Optional) For command-line use or custom Edge path (e.g., if multiple installs):
    • Run: ChromeDevExtWarningPatcher.exe --customPath "C:\Program Files (x86)\Microsoft\Edge\Application\131.0.2903.134" (replace with your exact version folder).
    • Other flags: --groups 0,1,2 to select specific patches (see patterns.xml in the tool for details).
  5. Restart Edge. The warning should be gone for new tabs/windows. To uninstall, run the tool again and select the uninstall option.

Notes: The tool requires admin rights and may trigger antivirus (it's safe, but scan if concerned). It also patches extras like URL elision hiding and Manifest V3 limitations. For uninstall, use the GUI—command-line mode doesn't fully support it.

If none work or you're on macOS/Linux, consider group policies via ExtensionDeveloperModeSettings (set to 1 to restrict the mode toggle, but it won't suppress warnings) or switch to Chrome where similar tools are more mature. Update Edge regularly, as Microsoft may patch these workarounds.

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Pub: 08 Oct 2025 01:59 UTC

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