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Asked: 2026-05-10T19:11:20+00:00

I just spent half an one our to find out what caused the Error-Message

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I just spent half an one our to find out what caused the Error-Message ‘Ci is not defined’ in my JavaScript code. I finally found the reason:

It should be (jQuery):

$('asd').bla();

It was:

('asd').bla();

(Dollar sign gone missing)

Now after having fixed the problem I’d like to understand the message itself: What does Firefox mean when it tells me that ‘Ci’ is not defined. What’s ‘Ci’?

Update: I’m using the current version of Firefox (3.0.3).

To reproduce, just use this HTML code:

<html><head><title>test</title> <script> ('asd').bla(); </script> </head><body></body></html>

To make it clear: I know what caused the error message. I’d just like to know what Firefox tries to tell me with ‘Ci’…

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1 Answer

  1. I don’t know which version of FF you are using, but regardless, the message is probably referring to the fact that bla() is not a function available on the String object. Since you were missing the $, which means you were missing a function, ('asd') would evaluate to a string, and then the JavaScript interpreter would try to call bla() on that object. So, if you had the following code in your project:

    String.prototype.bla = function() {};  // now this next line will execute without any problems: ('asd').bla();

    So, it is possible that Ci is some internal Firefox symbol that simply refers to the idea of a function. That is my guess, I imagine you are going to need someone that knows something about Firefox’s internals to get a better answer to this question…

    UPDATE: I am running your example code in the exact same version of FF as you are, but it reports the error as:

    Error: ‘asd’.bla is not a function
    Source File: file:///C:/test.html
    Line: 3

    Perhaps you have an extension/plug-in running that does something with this? Maybe some Greasemonkey script or something?

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