An error occurred while trying to find updates for feedly

"Add-ons" > "Find Updates" always results in "An error occurred while trying to find updates for feedly" result. While I don't think this is a critical issue, because feedly itself does partial incremental updates, I think this problem prevents full updates.

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In Error Console, following messages appear:

Datasource: Addon Update Started: feedly@devhd

RDFItemUpdater:checkForUpdates sending a request to server for: https://feeddo.fileburst.com/release/..., item = ({id:"feedly@devhd", version:"1.2", installLocationKey:"app-profile", minAppVersion:"3.0", maxAppVersion:"3.6a1pre", name:"feedly", xpiURL:"", xpiHash:"", iconURL:"chrome://mozapps/skin/xpinstall/xpinstallItemGeneric.png", updateRDF:"https://feeddo.fileburst.com/release/update.rdf", updateKey:"", type:2, targetAppID:"{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"})

RDFItemUpdater::onXMLLoad: TypeError: channel.securityInfo is null

Datasource: Addon Update Ended: feedly@devhd, status: 4

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Diagnose: After nsIExtensionManager service, used by Firefox to update add-ons, retrieves an add-on's update RDF resource, it attempts to check the SSL cert returned in the response. In feedly's case, it's missing because "HTTPS://feeddo.fileburst.com/release/update.rdf" is redirected to "HTTP://www.feedly.com/release/update.rdf".