CODEWITHSUNDEEP
firefoxfirefox-addon
Pan Ruochen
Pan Ruochen

Reputation: 2070

How can extension access global variables in other pages

There is a web page which contains the following parts:

<script language="javascript">
var g_GlobalVar1 = "Global Variable 1";
</script>

So how the variable g_GlobalVar1 can be accessed by the DOMContentLoaded handler function of the Firefox extension script?

Upvotes: 1

Views: 814

Answers (1)

Wladimir Palant
Wladimir Palant

Reputation: 57651

For security reasons, privileged code doesn't access web pages directly but through XPCNativeWrapper. This means in particular that you normally cannot read out any JavaScript properties that the web page added. You can bypass the security layer and access the variable as wnd.wrappedJSObject.g_GlobalVar1 but this isn't recommended and you should consider using an alternative approach (which one depends on what you are trying to do with this web page).

Upvotes: 2

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