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ReferenceError: GM_xmlhttpRequest not defined

I get a ReferenceError in the following usercript code:

// ==UserScript== // @name ... // @namespace ... // @description ... // @include ... // @grant GM_xmlhttpRequest // ==/UserScript== console.log(GM_info); try { console.log(GM_xmlhttpRequest({ method: "GET", url: "http://google.ca/", synchronous: true }).readyState); } catch (e) { console.log(e); } ...

It first logs GM_info successfully, then writes a ReferenceError. (I am using Firefox / Firebug.)

ReferenceError: GM_xmlhttpRequest not defined

Why am I getting this error?

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3 answers

Reinstalling the script fixes the problem. I do not need to restart Firefox, but it can be useful for other people. Brock's answer provides helpful debugging tips for such problems.

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I had the same issue and this was fixed for me:

 // @grant GM_xmlhttpRequest
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Starting with the news release (GM 4.0), this error occurred when using GM_xmlhttpRequest since GM_xmlhttpRequest was replaced by: GM.xmlHttpRequest .

New code:

 // ==UserScript== // @name ... // @namespace ... // @description ... // @include ... // @grant GM.xmlHttpRequest // ==/UserScript== console.log(GM_info); try { console.log(GM.xmlHttpRequest({ method: "GET", url: "http://google.ca/", synchronous: true }).readyState); } catch (e) { console.log(e); } //...

Greasemonkey: "GM_xmlhttpRequest not defined" with new update

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