Add-ons - Mozilla | MDN
Add-ons allow developers to extend and modify the functionality of Firefox. They are written using standard Web technologies - JavaScript, HTML, and CSS - plus some dedicated JavaScript APIs. Among other things, an add-on could: Change the appearance or content of particular websites Modify the Firefox user interface Add new features to Firefox There are several types of add-ons, but the most comm
Category:Example code - MozillaZine Knowledge Base
Up to Development Articles in this category demonstrate the code to do certain things in Mozilla-based products (at this moment, mostly for use in extensions). Development documentation is in process of being moved to Mozilla Development Center (MDC). You can find more documentation there. XUL Creating toolbar buttons (moved to Devmo) Adding items to menus using overlays (talks about browser's con
Code snippets - Archive of obsolete content | MDN
This is an archived page. It's not actively maintained. Support for extensions using XUL/XPCOM or the Add-on SDK was removed in Firefox 57, released November 2017. As there is no supported version of Firefox enabling these technologies, this page will be removed by December 2020. Add-ons using the techniques described in this document are considered a legacy technology in Firefox. Don't use these
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