Add support for the Sepolia testnet alongside Ethereum mainnet:
- New src/shared/networks.js with network definitions (mainnet + sepolia)
including chain IDs, default RPC/Blockscout endpoints, and explorer URLs
- State now tracks networkId; defaults to mainnet for backward compatibility
- Network selector in Settings lets users switch between mainnet and Sepolia
- Switching networks updates RPC URL, Blockscout URL, and chain ID
- All hardcoded etherscan.io URLs replaced with dynamic explorer links
from the current network config (sepolia.etherscan.io for Sepolia)
- Background handles wallet_switchEthereumChain for both supported chains
and broadcasts chainChanged events to connected dApps
- Inpage provider fetches chain ID on init and updates dynamically via
chainChanged events (no more hardcoded 0x1)
- Blockscout API uses eth-sepolia.blockscout.com for Sepolia
- Etherscan label/phishing checks use the correct explorer per network
- Price fetching skipped on testnets (tokens have no real value)
- RPC validation checks against the selected network's chain ID
- getProvider() uses the correct ethers Network for Sepolia
API endpoints verified:
- Etherscan: sepolia.etherscan.io
- Blockscout: eth-sepolia.blockscout.com/api/v2
- RPC: ethereum-sepolia-rpc.publicnode.com
closes#110
- Content script sends UUID via location.origin instead of "*"
- Inpage UUID listener removes itself after first message to prevent
malicious pages from overriding the persisted UUID
UUID is generated once via crypto.randomUUID(), persisted in
chrome.storage.local, and sent from the content script to the
inpage script via postMessage.
Major changes:
- Fetch token balances and tx history from Blockscout API (configurable)
- Remove manual token discovery (discoverTokens) in favor of Blockscout
- HD address gap scanning on mnemonic import
- Duplicate mnemonic detection on wallet add
- EIP-6963 multi-wallet discovery + selectedAddress updates in inpage
- Two-tier balance refresh: 10s while popup open, 60s background
- Fix $0.00 flash before prices load (return null when no prices)
- No-layout-shift: min-height on total value element
- Aligned balance columns (42ch address width, consistent USD column)
- All errors use flash messages instead of off-screen error divs
- Settings gear in global title bar, add-wallet moved to settings pane
- Settings wells with light grey background, configurable Blockscout URL
- Consistent "< Back" buttons top-left on all views
- Address titles (Address 1.1, 1.2, etc.) on main and detail views
- Send view shows current balance of selected asset
- Clickable affordance policy added to README
- Shortened mnemonic backup warning
- Fix broken background script constant imports
Three-part architecture:
- inpage.js: creates window.ethereum in page context with
request(), on(), send(), sendAsync(), enable() methods.
Sets isMetaMask=true for compatibility.
- content/index.js: bridge between page and extension via
postMessage (page<->content) and runtime.sendMessage
(content<->background).
- background/index.js: handles RPC routing. Proxies read-only
methods (eth_call, eth_getBalance, etc.) to configured RPC.
Handles eth_requestAccounts (auto-connect for now),
wallet_switchEthereumChain (mainnet only), and returns
informative errors for unimplemented signing methods.
Manifests updated with web_accessible_resources for inpage.js.
Build updated to bundle inpage.js as a separate output file.
