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Set startup password in Firefox 57.0

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I want to set startup password (required just to use Firefox), like it was possible in previous version using "StartupMaster" add - on. How can I do this in Firefox Quantum 57.0?

I want to set startup password (required just to use Firefox), like it was possible in previous version using "StartupMaster" add - on. How can I do this in Firefox Quantum 57.0?

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StartupMaster had to with the Master Password, not with just launching Firefox, but if you had a Homepage set that has login code on that page it would appear as merely a "start up" feature.

Whatever, currently there is no WebExtension version of StartupMaster is available.