WebExtensions - MDN Web Docs Glossary: Definitions of Web-related terms
webextensions is a cross-browser system for developing browser extensions in firefox.

Index
676 index add-ons, glossary, guide, index found 689 pages: 677 signing and distributing your add-on add-ons, extensions, webextensions, distribution, publication, reviews, signing add-ons need to be signed before they can be installed into release and beta versions of firefox.
... 678 make money from browser extensions guide, monetization, webextensions, distribution while users can download browser extensions for firefox free of cost from addons.mozilla.org (amo), this doesn’t mean you can’t make money from browser extensions, and to a more limited extent themes.
... 679 promoting your extension or theme add-ons, extensions, promotion, themes, webextensions, distribution so you’ve written a great extension, but only a few people have found and installed it from addons.mozilla.org—despite your efforts to create an appealing listing.
...And 2 more matches

Add-ons
developing extensions in the past, there were several toolsets for developing firefox extensions, but as of november 2017, extensions must be built using webextensions apis.
... extensions written using webextensions apis for firefox are designed to be cross-browser compatible.
...we are currently building support for the webextensions api on geckoview.

Index - Archive of obsolete content
310 bookmarks.export() api, add-ons, bookmarks, extensions, method, non-standard, reference, webextensions, export exports bookmarks to an html bookmark file.
... 311 bookmarks.import() api, add-ons, bookmarks, extensions, method, non-standard, reference, webextensions, import imports bookmarks from an html bookmark file.

about:debugging - Firefox Developer Tools
note: it's recommended that you use the browser toolbox, not the add-on debugger, for debugging webextensions.
... see debugging webextensions for all the details.

Index - Web APIs
1138 element.openorclosedshadowroot api, add-ons, element, extensions, mozilla, needs privileges, non-standard, property, reference, webextensions, openorclosedshadowroot, shadow dom the element.openorcloseshadowroot read-only property represents the shadow root hosted by the element, regardless if its mode is open or closed.
... 1990 history api advanced, dom, html5, history the dom window object provides access to the browser's session history (not to be confused for webextensions history) through the history object.

<iframe>: The Inline Frame element - HTML: Hypertext Markup Language
non-standard attributes mozbrowser see bug 1318532 for exposing this to webextensions in firefox.
... available only to webextensions.

chrome - Archive of obsolete content
this module should not be confused with the "chrome" global variable that webextensions can use to access apis.

Developing for Firefox Mobile - Archive of obsolete content
see developing webextensions for firefox for android to learn more about development of webextensions for firefox for android.

Appendix E: DOM Building and Insertion (HTML & XUL) - Archive of obsolete content
for webextensions the most simple way is sanitize the output about javascript inline declaration and other wrong content.

Index of archived content - Archive of obsolete content
.jsm prompt.jsm runtimepermissions.jsm snackbars.jsm sound.jsm tab addons developer guide code snippets creating a user interface firefox hub walkthrough initialization and cleanup prerequisites walkthrough webextensions for firefox for android listening to events in firefox extensions migrating from internal linkage to frozen linkage migrating raw components to add-ons multiple item extension packaging offering a context menu for form controls overlay extensions firefox addons deve...

Index - MDN Web Docs Glossary: Definitions of Web-related terms
494 webextensions codingscripting, glossary, needscontent, webextensions webextensions is a cross-browser system for developing browser extensions in firefox.

MDN Web Docs Glossary: Definitions of Web-related terms
l urn usenet user agent utf-8 ux v validator value variable vendor prefix viewport visual viewport voip w w3c wai wcag web performance web server web standards webassembly webdav webextensions webgl webidl webkit webm webp webrtc websockets webvtt whatwg whitespace world wide web wrapper x xforms xhr (xmlhttprequest) xhtml xinclude xlink xml xpath xquery xslt other ...

Introduction to events - Learn web development
also, it is important to understand that the different contexts in which javascript is used have different event models — from web apis to other areas such as browser webextensions and node.js (server-side javascript).

Theme concepts
themes developed using the webextensions api in firefox enable you to change the look of the browser by adding images to the header area of the firefox browser; this is the area behind the menu bar, toolbars, address bar, search bar, and tab strip.