how do we check if this is a content script?

We develop extensions for Firefox. The script needs to know if it is a content script or a background script (sometimes the same script can be both a content script and a background script). We tried to do it with the following code:

if (typeof exports === 'undefined') {
    // we're in a content script.
} else {
    // we're in a background script.
}

But the problem is that typeof exports is not 'undefined' in some content scripts. Is there a better way to know when we are in a content script?

Edit : I has a mistake and actually typeof exports is 'undefined' in the content script. So maybe checking typeof exports is a reliable way to identify content scripts.

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The first thing that came up into my mind - include some separate file to extension as content script, that will have global variable. Eg file content_script_definition.js:

isContentScript = true;

And then use next code:

if (typeof isContentScript !== 'undefined' && isContentScript) {
    // we're in a content script.
} else {
    // we're in a background script.
}

Maybe there is some documented functionality, not sure about this...

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其他方式

if(String(this).indexOf("Sandbox") >= 0){
  //main.js
}
else{
  //content script
}

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