variable cache is undefined

Fri, 26 Jun 2020 06:38:26 -0700 

Hi all,

I am using the GNU LibreJS firefox extension version 7.20.2, with firefox
77.0.1.

I get the following error while visiting an https localhost site:
TypeError: "cache is undefined"
    fetchWebLabels moz-extension://XXX/content/externalLicenseChecker.js:29
    fetchLicenseInfo
moz-extension://XXX/content/externalLicenseChecker.js:70
    checkLicensedScript
moz-extension://XXX/content/externalLicenseChecker.js:81
    <anonymous> moz-extension://XXX/content/externalLicenseChecker.js:89
    <anonyme> moz-extension://XXX/content/externalLicenseChecker.js:92

content of variable m defined in     <anonymous>
moz-extension://XXX/content/externalLicenseChecker.js:8:
{action: "checkLicensedScript", cache: undefined, url: "
https://localhost/XXXX"}

Maybe this is unrelated, but the MSDN guidelines is against using async
function for browser.runtime.onMessage.addListener as it is done in
externalLicenseChecker.js:86. Guideline:
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/onMessage

Best regards,
Benoît

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