the reason i think the expression is the issue is if I changed the literal 
text "cssRules" to anything else it would not error & stop execution, it 
will not do what I wanted but does not stop the rest of GM script.

in short, this wont work & stops GM execution:

document.styleSheets[x].cssRules

but all these undefined elms will continue the rest of code:

document.styleSheets[x].cssRules1
document.styleSheets[x].cssRulesx
document.styleSheets[x].cssRules123
document.styleSheets[x].cssRulesxyz

any clues?

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