User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0 Build ID: 20180412172954 Steps to reproduce: I encountered this bug while developing an extension: 1. Create a webextension. 2. From the background page, call `executeScript` with `frameId` and `allFrames` arguments at the same time. I also made a demo repo: 1. Clone https://github.com/eight04/webextension-test. (The executable path inside package.json probably has to be modified.) 2. Run command `npm install && npm start`. It installs web-ext and launches the browser. 3. Open the addon debugger and the error is shown. Actual results: The promise returned by executeScript is rejected with the following error: Error: 'frameId' and 'allFrames' are mutually exclusive Expected results: Quote from MDN: > allFrames Optional > ... If true and frameId is set, then the code will be injected into the specified frame and all its child frames. ... https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs/executeScript#Parameters I also found a ticket related to this issue, which is under the documentation category: https://bugzilla.mozilla.org/show_bug.cgi?id=1346941

This is not a bug. frameId and allFrames are mutually exclusive. The documentation should be fixed, though.

I have re-opened the other bug because it is older and has a test case for QA, and will mark this as a duplicate against that other bug.

Note: The other bug has STR that QA can use to verify this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1346941#c1 We decided to re-open this bug because this restriction is an unnecessary difference in compatibility with the behavior of Chrome's tabs.executeScript API.

I'm holding off the implementation until the refactor in bug 1484373 has landed and sticks.