support commands for reading now and/or later on Vimperator.

.vimperatorrc.readable.vimp

" Evernote Clearly: Clipper: Clip: " {{{
"   Evernote Clearly :: Add-ons for Firefox
"     https://addons.mozilla.org/ja/firefox/addon/clearly/
"   Evernote Web Clipper :: Add-ons for Firefox
"     https://addons.mozilla.org/ja/firefox/addon/evernote-web-clipper/

" Clearly (toggle)
nnoremap e :<C-u>js __readable_by_evernote.__readable_by_evernote__launch(false)<CR>
" Clip to Evernote
nnoremap E :<C-u>js __readable_by_evernote.__readable_by_evernote__launch(true)<CR>
nmap <Leader>ea E
" }}}


" Instapaper: (simple version) " {{{

nnoremap <Leader>ia :<C-u>instapaper<CR>

let g:instapaper_username = 'USERNAME'
let g:instapaper_password = 'PASSWORD'

js << EOM
// require: _libly.js
commands.addUserCommand(
  ['instapaper'],
  'add pages to Instapaper',
  function (args) {

    function toQuery(qs) {
      return [i + '=' + encodeURIComponent(qs[i])
        for (i in qs)
      ].join('&');
    }

    var req = new plugins.libly.Request(
      'https://www.instapaper.com/api/add',
      {
      },
      {
        postBody: toQuery({
          username: liberator.globalVariables.instapaper_username,
          password: liberator.globalVariables.instapaper_password,
          url: buffer.URL,
        })
      }
    );

    req.addEventListener('success', function(data) {
      liberator.echo('This URL has been successfully added to your Instapaper account.');
    });

    req.addEventListener('failure', function(data) {
      liberator.echoerr(data.statusText);
      liberator.echoerr(data.responseText);
      //liberator.echoerr('This URL has failed to add to your Instapaper account.');
    });

    req.addEventListener('exception', function(data) {
      liberator.echoerr(data.statusText);
      liberator.echoerr(data.responseText);
      //liberator.echoerr('This URL has failed to add to your Instapaper account.');
    });

    req.post();

  },{
    literal: 0,
  },
  true
);
EOM
" }}}


" Readability: " {{{
"   Readability :: Add-ons for Firefox
"     https://addons.mozilla.org/ja/firefox/addon/readability/

" read immediately
nnoremap <Leader>ra :<C-u>js rdb.firefox.overlay.read_now()<CR>
" read later
nnoremap <Leader>rl :<C-u>js rdb.firefox.overlay.read_later()<CR>
" send to kindle
nnoremap <Leader>rk :<C-u>js rdb.firefox.overlay.send_to_kindle()<CR>
" }}}


" CSS on/off (toggle): css: " {{{
nnoremap ! :<C-u>set invum<CR>
" }}}

Nice share. Do you type in :rk to send to your Kindle?

It's not working for me with the combinations I'm trying. But simply :js rdb.firefox.overlay.send_to_kindle() does work.

@eoinoc In the case of <Leader>rk, you should type not :rk but \rk by default. (cf. :help <Leader>)