I found a workaround.

• Find Install path of extension using Extension ID

  • Windows: C:\\Users\\[YourUsername]\\AppData\\Local\\Google\\Chrome\\User Data\\Default\\Extensions\\{ExtensionID}
  • Linux: ~/.config/google-chrome/Default/Extensions/{ExtensionID}
  • For me: Extension ID is fbliobpicoanacbncphlgaghdkodkgme (Source: chrome://extensions/)

• Edit Manifest.json — It's better to copy extension folder to another folder and then edit.

add below line afer every "matches":[]

      ,"exclude_matches": [
        "https://atcoder.jp/contests/*/tasks/*"
      ],
}

• Load Unpacked.