Bug 853541 - Partially revert bug 835552, making load() be cwd-relative again. r=njn

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extra : rebase_source : cc75800ec61f900ecf9d4a478eceaef7a67690dd
Static rooting analysis updates for browser. No bug. r=NPOTB

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extra : rebase_source : f7e8f1f3039c6ebaa3dabea2a7c181a880d1792b