Style/CSS injection issue – extension forces purple tint and duplicate headers across multiple sites

When the “Second Me” extension is enabled (even if set to “On click”), sites including localhost and other domains load with incorrect styling:

• Brand colours shift (e.g., correct colour becomes purple)

• Duplicate UI elements (e.g., two headers)

• Visual corruption appears immediately on page load

• Browser: Brave Browser on Ubuntu 25

• Extension version: 1.1.3 (ID: iplpjgbkmkccekbflkdiejihgjcelloa)

• Affected sites: localhost (development), multiple production domains

• Cache, cookies, local storage cleared; service worker unregistered. Issue persists.

• Changing hardware acceleration and forcing sRGB colour profile had no effect while the extension is active.
  
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  Example on chatgpt: