Update styletag injection to use <style> for platforms other than firefox #508
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In order to bypass
style-src
CSP restrictions in Firefox, we use a link element. However this creates a CSP issue on other platforms on websites that havestyle-src 'unsafe-inline'
in their CSP, which is relatively common: we're not able to inject a link element. This PR updates our injection technique to only use link elements in Firefox, and normal style elements elsewhere.