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+=====================
+WebExtensions Wallet
+=====================
+
+------------
+Introduction
+------------
+
+The WebExtensions Wallet (*wxwallet*) can be used to pay with GNU Taler on web
+sites from within modern web browsers. The `WebExtensions
+<https://wiki.mozilla.org/WebExtensions>`_ API interface that enables the
+development cross-browser extensions. Google Chrome / Chromium, Mozilla
+Firefox, Opera and Microsoft Edge will all offer support for WebExtensions in
+the future.
+
+Currently Chrome hast the best support for WebExtensions (since the API is a superset
+of Chrome's extension API).
+
+-----------------------
+Development Environment
+-----------------------
+
+The *wxwallet* mainly written in the `TypeScript
+<http://www.typescriptlang.org/>`_ language, which is a statically typed
+superset of JavaScript.
+
+While the *wxwallet* is mainly intended to be run from inside a browser, the
+logic is implemented in browser-independent modules that can also be called
+from other environments such as `nodejs <https://nodejs.org>`_. This is
+especially useful for automatically running unit tests.
+
+
+-----------------
+Project Structure
+-----------------
+
+.. parsed-literal::
+
+ **manifest.json** extension configuration
+ **package.json** node.js package configuration
+ **tsconfig.json** TypeScript compiler configuration
+ **lib/**
+ **vendor/** 3rd party libraries
+ **wallet/** actual application logic
+ **emscripten/** emscripten object file and glue
+ **test/**
+ **run_tests.js** nodejs entry point for tests
+ **tests/** test cases
+ **content_scripts/notify.ts** wallet<->website signaling
+ **backgrond/main.ts** backend entry point
+ **img/** static image resources
+ **style/** CSS stylesheets
+ **pages/** pages shown in browser tabs
+ **popup/** pages shown the extension popup
+
+----------
+Emscripten
+----------
+
+`Emscripten <https://kripken.github.io/emscripten-site/index.html>`_ is C/C++
+to JavaScript compiler. Emscripten is used in the *wxwallet* to access
+low-level cryptography from *libgcrypt*, and miscellaneous functionality from
+*libgnunetutil* and *libtalerwallet*.
+
+
+--------------------------------------
+Target Environments and Modularization
+--------------------------------------
+
+Modules in the wallet are declared in TypeScript with
+the ES6 module syntax. These modules are then compiled
+to `SystemJS <https://github.com/systemjs/systemjs>`_ `register` modules.
+
+SystemJS modules can be loaded from the browser as well as from nodejs.
+However they require special entry points that configure the module system,
+load modules and execute code. Examples are `backgrond/main.ts` for the
+browser and `test/run_tests.js` for nodejs.
+
+Note that special care has to be taken when loading the Emscript code,
+as it is not compatible with the SystemJS module, even in the `globals`
+compatibility mode.
+
+The TypeScript sources in the *wxwallet* are compiled down to ES5, both to
+enable running in node.js without transpilers and to avoid a `bug
+<https://github.com/Microsoft/TypeScript/issues/6426>`_ in the TypeScript
+compiler.
+
+----------------------------
+IndexedDB Query Abstractions
+----------------------------
+
+The *wxwallet* uses a fluent-style API for queries on IndexedDB.
+
+TODO: say more