用户修改，删除，增加进行了修改

feige

2024-06-10 aef876fd5e4f26eead249243b1523ec4cf355340

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var userAgent = require('../internals/engine-user-agent');
 
var firefox = userAgent.match(/firefox\/(\d+)/i);
 
module.exports = !!firefox && +firefox[1];