when editing, preview is broken and WYSIWYG toolbar is hidden

[snarfed]

here are the errors i see in the JS console when i click on preview:

TypeError: $.GollumEditor is not a function
wiki-e0b...js:2:9139

mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create
frameworks-d22...js:34:1559

TypeError: $(...).onFocusedInput is not a function
github-f48...js:1:11880

TypeError: $(...).fire is not a function
frameworks-d22...js:176:7314

Use of getPreventDefault() is deprecated.  Use defaultPrevented instead.
129930.user.js:35:0

TypeError: $(...).fire is not a function
frameworks-d22..js:176:7517

and here's the CSS rule that's hiding the toolbar, from github2-817...css:

#gollum-editor-function-bar #gollum-editor-function-buttons {
    display: none;
    float: left;
}

if i remove the display: none, the toolbar shows up, but the question mark (help) button doesn't hide the expanded help section, which expands automatically with this userscript, and which is why i wanted to use the toolbar. :P

TypeError: $(...).fire is not a function
frameworks-d22...js:176:7314

TypeError: $.hidden is undefined
wiki-e0b...js:1:6800

[snarfed]

i should have said at the beginning: thank you so much for writing this userscript! it's great!

also, i'm on firefox 36.0.1 on mac os x, using the userscript in greasemonkey.