Why Is My Greasemonkey Script Not Working After Upgrading to Version 1.0?

jQuery Conflict in Greasemonkey 1.0

Since the release of Greasemonkey 1.0, many users have encountered issues with their Greasemonkey scripts not running properly when interacting with websites that also utilize jQuery. This conflict stems from the newly introduced @grant code.

Understanding the Conflict:

After upgrading to Greasemonkey 1.0, the sandbox mechanism for Greasemonkey scripts has fundamentally changed. The @grant code, which allows scripts to request specific APIs, is now required for scripts to access the page's environment, including jQuery. However, when a website already has jQuery, conflicts occur due to conflicting versions and namespaces.

Addressing the Issue:

There have been numerous attempts to resolve this conflict. One suggested solution is to utilize:

this.$ = this.jQuery = jQuery.noConflict(true);

However, this approach does not guarantee compatibility in all cases. A more effective strategy is to restore the sandbox.

Restoring the Sandbox:

To restore the sandbox and mitigate conflicts, edit your Greasemonkey script's Metadata Block and add the following lines:

// @grant       GM_addStyle
// @grant       GM.getValue
// ==/UserScript==

These @grant directives specify APIs that are commonly used in Greasemonkey scripts. By including them, the sandbox is re-enabled and conflicts are resolved.

Additional Notes:

This sandbox restoration method ensures compatibility with superior engines like Tampermonkey and Violentmonkey. It is a more stable and reliable solution than modifying jQuery namespaces.

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