[browser defs] Add some methods
[browser defs] Add some methods

Closes #850

fileability/tern,ternjs/tern,marijnh/tern,othree/tern,fileability/tern,marijnh/tern,ternjs/tern,marijnh/tern,othree/tern,MarcelGerber/tern,ternjs/tern,emacsmirror/tern,neoclide/tern,fileability/tern,emacsmirror/tern,othree/tern,neoclide/tern,MarcelGerber/tern,emacsmirror/tern,neoclide/tern,MarcelGerber/tern