316
edits
Changes
added .innerHTML
* All attributes of nsIURI.spec are read-only, use for example url.mutate().setQuery(aQuery).finalize(); More examples in {{bug|1440693}}.
* Components.utils.import() has changed to ChromeUtils.import(). The old form still works (but is slower)
* Assignment to .innerHTML of an element does not work any more in chrome documents. As a temporary workaround, .setUnsafeInnerHTML or |document.allowUnsafeHTML = true;| can be used. This workaround was removed at mozilla61. The correct solution is to use .textContent, document.createElement(), DOMParser.parseFromString or document.execCommand("insertHTML", ...). Note that the jQuery library uses .innerHTML.
* Expression Closures have been dropped: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Operators/Expression_closures (use arrow functions).
== Also Note ==
The list above only contains selected changes relevant to '''Thunderbird''' add-ons. A larger list, some of which are only relevant to Firefox, can be seen at [https://developer.mozilla.org/en-US/Firefox/Releases Firefox developer release notes] where all the details, bugzilla bug reports and patches implementing the above changes, and more, can be found. If you find something missing in the list above, please tell us <tbd>.
