+++ This bug was initially created as a clone of Bug #1121471 +++ Expression closures (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Expression_closures) are a nonstandard language extension we'd like to remove from SpiderMonkey. For browser-ctrlTab.js, bug 1121471 already took care of the ctrlTab object's selected, isOpen, tabCount and tabPreviewCount getters. However, the allTab object's toolbarButton and canOpen getters still use expression closures: http://hg.mozilla.org/mozilla-central/annotate/0190a1d17294/browser/base/content/browser-ctrlTab.js#l574 The general pattern for getters is that: get x() y, needs to be replaced with: get x() { return y; },

Comment on attachment 8576988 [details] [diff] [review] rev 1 - Remove expression closures from browser-ctrlTab.js Looks good!