Building the actions extension against epiphany 3.3.5 tarball gives this warning (which is to be considered fatal):

ephy-actions-extension-editor-dialog.c: In function 'ephy_actions_extension_editor_dialog_edit_selected':
ephy-actions-extension-editor-dialog.c:576:12: warning: variable 'actions' set but not used [-Wunused-but-set-variable]
ephy-actions-extension.c: In function 'ephy_actions_extension_run_action_on_embed_property':
ephy-actions-extension.c:462:2: warning: implicit declaration of function 'ephy_window_get_context_event' [-Wimplicit-function-declaration]
ephy-actions-extension.c:462:8: warning: assignment makes pointer from integer without a cast [enabled by default]


ephy_window_get_context_event has been moved to ephy_private.h and is thus no longer available to extensions.