Duplicating windows regression with 143.0.3638.1

What to try first

• Confirm it’s Edge-specific
  • Open Edge and try the same link behavior in an incognito/private window. If the issue doesn’t reproduce, it’s likely related to your profile or a site/extension interaction.
  • Try with another browser (Chrome/Chromium-based) to see if the problem is Windows-OS or Edge-specific.
• Check for well-known regression/workarounds
  • Some users reported window handling quirks after Edge profile corruption or certain startup/default browser settings. A few common fixes:
    • Reset Edge flags to default (edge://flags). If you’ve disabled or changed flags related to tab/window behavior, reset to default and restart.
    • Disable “Continue running background apps when Microsoft Edge is closed” in Edge settings (Settings > System and performance). Then restart Edge.
    • Ensure “Let Internet Explorer mode run on this device” is not interfering (older settings sometimes affect windowing; check Edge/Windows features).
• Inspect edge://settings/system and startup behavior
  • Settings > System and performance > Open your browser in a background tab? If enabled, toggle off and test.
  • Settings > Appearance > Show favorites bar, etc. (not likely the cause, but the overall reset sometimes helps).
• Profile and state hygiene
  • Try a clean profile:
    • Close Edge.
    • Start Edge with a new profile: edge --profile-directory="Profile 2" (or create a new profile from edge://settings/people).
    • Test the behavior with links opened from a Windows app using the new profile.
  • If the new profile eliminates the issue, your original profile may be corrupted. Consider exporting bookmarks and resetting/creating a fresh profile.
• Extensions and startup behavior
  • Disable all extensions temporarily:
    • edge://extensions
    • Turn off all extensions, then restart Edge and reproduce.
  • If the problem goes away, re-enable extensions one by one to identify the culprit.
• Windows interaction notes
  • Windows 11 sometimes decides how external applications open links (new window, new tab, reuse) based on default browser behavior and taskbar/window management settings. Ensure Edge is set as default browser:
    • Settings > Apps > Default apps > Microsoft Edge > set defaults for HTTP/HTTPS.
  • Check Windows 'Multiple desktops' or task view behavior. If you have a lot of windows/desktops, some interactions might look like duplicates.
• Windows display/keyboard shortcuts
  • Edge’s window management can be influenced by shortcuts or accessibility features. Ensure no accessibility feature (Like “Always open windows in a new process” in some apps) is triggering, though Edge typically doesn’t ship a setting by that name.

If you want, I can help you craft a targeted debugging checklist or provide a short script to reproduce the behavior (e.g., open a known link from a Windows app and log Edge process/window creation) to isolate whether it’s:

• a profile problem
• an extension causing the duplication
• an OS/window-management quirk

Yes it's happening to me as well. I submitted feedback with a recording. I click on a link in Outlook for example and it opened 3 more windows of Edge, complete with duplicates of my existing session with all tabs open. Very strange bug.

Also it seems like intermittently even just `ctrl-n` spawning a new window will duplicate my existing window rather than creating a new blank window