wallet-inject.js runs in the isolated world of https://*.x pages and exposes
window.bitcoincash { isTheseus, version, network, getAddress, signAndSend,
signMessage }. Every call is routed page -> addon-page-msg -> activate()
handler -> approval overlay showing the requesting origin:
- getAddress: approval with an "always allow" checkbox; grants persist in
api.storage.permissions and are listed/revocable under Settings.
- signAndSend / signMessage: approval on every call, never remembered.
signMessage returns a BIP-137 recoverable signature (verified offline).
- one pending approval per origin; page-facing errors never echo balance.
Host fix: the inject IPC assigned event.returnValue twice, so pages always
got an empty script list.
Manifest declaring sidebar-panel, vault-derive, page-inject (https://*.x)
and approval-modal; registers the Wallet sidebar panel. Shows up in
Settings > Extensions and opens from the sidebar.
