The deprecated, non-standard window.crypto interfaces were removed from Firefox 35 and later releases. The removal of these interfaces caused compatibility issues with some banking and government sites. This addon re-implements window.crypto.signText as a stop-gap measure that can be used to restore this functionality on affected sites.
See https://wiki.mozilla.org/SecurityEngineering/Removing_Proprietary_window.crypto_Functions for more background information.
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