Accessing files is not feasible with Firefox 17.0.1 extension

Ever since upgrading to Firefox 17.0.1, I have encountered an issue with PrivilegeManager no longer being supported. While some suggest that simply removing a line of code should fix the problem, it seems that is not the case for me.

Every time I try to run my code, I keep getting this error: TypeError: Components.classes is undefined. Could there have been changes related to Components.classes as well? The Mozilla Code Snippets page (https://developer.mozilla.org/en-US/docs/Code_snippets/File_I_O) mentions using the same syntax (without FileUtils.jsm).

This is the code in question:

//netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
var file = Components.classes["@mozilla.org/file/local;1"]
    .createInstance(Components.interfaces.nsILocalFile);

file.initWithPath(filePath);
javascriptfilefirefoxxul

Answer №1

Some users have pointed out that the code might be executed in the incorrect location (e.g., an unprivileged web-page context). However, it could also be a scoping issue.

If scoping is the problem, you can try the following:

const {Cc,Ci,Cu} = require("chrome");

var file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
file.initWithPath(filePath);

If the code is not running in the right place, executing require will result in an error.

Answer №2

After encountering a persistent issue, I finally found the solution to my problem: Initially, I was still using an outdated Privilege Manager in my code. Despite attempting to remove this line, it didn't resolve the issue. The root of the problem was that I was working from home where the extension wasn't functioning as intended; instead, it was being executed as a standard xul file out of convenience. As highlighted by Boris Zbarsky and paa above, it's crucial to run the code within the extension itself to access "chrome" privileges.

Upon making this adjustment and running the modified code (without the PrivilegeManager line), everything worked perfectly!

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