[Snyk] Upgrade web-ext from 2.7.0 to 2.9.3#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-upgrade-d294a1d99a5efe91d72d1fdcb5b6b690

+3,603-3,097

Commits on Oct 30, 2019

chore: upgrade web-ext from 2.7.0 to 2.9.3
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