export declare class FirefoxLedgerBridge {
    bridgeUrl: string;
    iframe: HTMLIFrameElement;
    constructor();
    getPublicKey(hdPath: string): Promise<string>;
    unlock(hdPath: string): Promise<{
        publicKey: string;
        address: string;
        chainCode?: string | undefined;
    }>;
    signTransaction(hdPath: string, tx: string): Promise<{
        s: string;
        v: string;
        r: string;
    }>;
    signPersonalMessage(hdPath: string, message: string): Promise<{
        v: number;
        s: string;
        r: string;
    }>;
    _setupIframe(): void;
    _getOrigin(): string;
    _sendMessage(msg: {
        action: string;
        params: any;
    }): Promise<any>;
}