While previously Firefox used one single OS process to mix browser code, extensions, and Web content, with its Electrolysis project, Mozilla is moving extensions into their own process.
Mozilla is beginning to make a series of changes to Firefox that’ll make certain aspects of the browser operate a lot more like Chrome.
To ensure third-party extensions provide customization without sacrificing security, performance or exposing users to malware, we will require all extensions to be validated and signed by Mozilla starting in Firefox 41, which will be released on September 22nd 2015. The company has also confirmed that add-ons that run on XPCOM and XUL languages will be slowly disapproved in the near future, and has been contemplating the exact plan of action to smoothen the process. However, the add-on model that arose naturally from these technologies is extremely permissive.
It’ll be interesting to see how this move will impact the Firefox add-on ecosystem. “This lack of modularity leads to many problems”. >more