Drop Feeds doesn't work on Firefox 61 on MacOS

Firefox 61 (release notes) added the following change that appears to break Drop Feeds:

WebExtensions now run in their own process on MacOS

After upgrading to Firefox 61, Drop Feeds fails to initialize with the following console error:

1530027186495 addons.xpi WARN Exception running bootstrap method startup on {42d52ade-6923-4f20-92d1-8db031269cc6}: Error: Out-of-process WebExtensions are not supported with multiple child processes (resource://gre/modules/Extension.jsm:1261:13) JS Stack trace: Extension@Extension.jsm:1261:13
startup@Extension.jsm:1172:22
callBootstrapMethod@XPIProvider.jsm:2757:20
startInstall/<@XPIInstall.jsm:2036:11

A temporary workaround is to set this setting (in about:config) extensions.webextensions.remote to false to allow Drop Feeds to initialize on MacOS.

More information on https://www.ghacks.net/2017/07/11/firefox-nightly-out-of-process-web-extensions/

Note: this page come from the issue Drop Feeds doesn't work on Firefox 61 (macOS), thank you to @jeffthieleke-wf to report this.