Browser-Shortcuts For The Online Docs
Using the power of Google, you can search the online manual by using the "site:www.wxwidgets.org/manuals/stable" term in your search:
Additionally, you can setup a Firefox bookmark keyword that allows you to type the following in the address bar to run this search:
wx wxframe
To set this up, bookmark this link, then open the properties for this bookmark. Type "wx" (or whatever you prefer for the trigger) in the "Keyword" field.
John Connors has put together a Firefox search plugin to accomplish the same task.