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Here we introduce NEX - a vendor-neutral packaging format for browser add-ons that we have initially implemented on top of the Chromium .crx format in Opera. We intend to further develop this as an open add-ons format through international standards bodies. Initially we intend to consolidate the differences between add-on execution environments themselves considering their current similarities. As a secondary objective we then aim to kick-start meaningful discussion around shared system and device-level APIs with a view to making browser add-ons first-class citizens of the web core.Opera Introduces NEX For Developers: Standards-Oriented Browser Add-Ons [my.opera.com]
To this end we are today introducing the NEX format. The NEX format is initially positioned as a super-set of the CRX development environment that Chromium web developers are already using. Opera has always maintained a strong commitment to international, open standards and has a long history of playing an active role in open web standards development. This does not change with our move to Chromium. One of our objectives for NEX is that over time we will move this format forward via web standards organisations such as the W3C, initially to create a shared packaging and manifest format for cross-browser add-on development, removing implied dependencies on the CRX format within our NEX runtime as we go.