javascript - Run a Greasemonkey script only once per page load? -

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if create greasemonkey script @include * , go site youtube, runs script 20+ times every time refresh. on firefox, not sure chrome.
there way prevent this?

first, don't want script run in iframes.
can block using the @noframes directive works in both greasemonkey , tampermonkey of october, 2014.

for older versions, or script engines don't support @noframes, can use code, after metadata block:

if (window.top != window.self)  //don't run on frames or iframes {     //optional: gm_log ('in frame');     return; }


second, can wait , fire gm code, once, on page load. wrap in main() , call on load event, so:

window.addeventlistener ("load", localmain, false);  function localmain () {     // code goes here. }


third, can exclude sites or pages adding // @exclude directives metadata block.

overall, it's best avoid universally included gm scripts, if possible.

other methods might set flags or reload page url parameters. these tricky save them last resort.


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