Simple web extension to detect when you've copied a bitcoin address (or something like looks like one) from a HTTP page.

• For Bech32, it uses the reference implementation to check if the copied text can be decoded. This is not perfect, for instance, bc1rw5uspcuh (from the test vectors) has an invalid program length but is still decodable and is detected by the extension.
• For P2PKH and P2SH it is even cruder, it checks if the copied text is the right version (first byte is 1 for P2PKH and 3 for P2SH), can be base58 decoded (using paulmillr/micro-base58), and has the right length (25 bytes).

Use web-ext to build the sources as follows

cd src-ff
web-ext build

and load the extension into Firefox.

Load the src-chrome directory into chrome.

• bjoern's StackOverflow answer from 2010

Files in src/3rdparty/ have their own licenses (see NOTICE.md). Other files are licensed under the Mozilla Public License 2.0.