We intend to deprecate and remove usage of WebSQL in third party contexts. Deprecation is targeted for M94 and removal is targeted for M97.
The Web SQL Database standard was first proposed in April 2009 and abandoned in November 2010. Gecko never implemented this feature and WebKit deprecated this feature in 2019. The W3C encouraged those needing web databases to adopt Web Storage or Indexed Database. We hope to entirely deprecate and remove WebSQL at some future point when usage is low enough.