'Changing value of server .js variable

I'm playing with fiddler scripting and I want to change value of server's js where there are a few calls of: "this.isChatAvailable = 0". I want to change it to "this.isChatAvailable = 1".

I tried to use this approach:

 if (oSession.HostnameIs("pageurl.com") {
    oSession.utilReplaceInResponse("this.isChatAvailable = 0","this.isChatAvailable = 1"); 
 }

but in both OnBeforeResponse and OnBeforeRequest methods when page is re-loaded it still don't show me the window which is blocked by mentioned variable.

Any idea what did I messed up here?

javascript

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'Changing value of server .js variable

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