tested Firefox 35.0 and 35.0.1 on Ubuntu 14.04 and 14.10: clicking on load does not popup a file dialog. On Chromium this works as expected.
also the Load drop-down menu (if you have saved a rro in the browser local storage) does not work: the menu goes away when you move your mouse towards the submenu items. This is also a problem on Chromium 39.0.2171.65 on Ubuntu 14.10
Related to issue #6.
I am working on this in a fork. I should have a pull request including a fix for this issue ready today sometime.
This has now been fixed. I changed the UI to make this work. Now when you hover over the Load button, all of the load options are displayed in a new UI element below the Load button.