Examine source code of LeetCode Contest Helper

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  "author": "Maozi Chen",
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        "https://leetcode-cn.com/contest/*",
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      "js": [
        "content.js"
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      "run_at": "document_start"
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  "browser_specific_settings": {
    "gecko": {
      "id": "{cf30a57a-ddbb-4f21-81f2-caad54e323ca}"
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