Bug 1652478 Comment 1 Edit History

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Original comment by
on 
This problem doesn't happen on Firefox.

On my environment, `tabs.executeScript` raises an error in the debugger console for the testcase addon:

```
can't access property "innerWindowID", browser is null ext-tabs.js:70
    awaitTabReady chrome://messenger/content/parent/ext-tabs.js:70
    promiseTabWhenReady chrome://messenger/content/parent/ext-tabs.js:272
    executeScript chrome://messenger/content/parent/ext-tabs.js:538
    executeScript self-hosted:935
    result resource://gre/modules/ExtensionParent.jsm:930
    withPendingBrowser resource://gre/modules/ExtensionParent.jsm:485
    result resource://gre/modules/ExtensionParent.jsm:930
    callAndLog resource://gre/modules/ExtensionParent.jsm:892
    recvAPICall resource://gre/modules/ExtensionParent.jsm:929
    AsyncFunctionNext self-hosted:684
```

The error is raised from https://searchfox.org/comm-central/rev/1598a3b8368c0b823505889ddd1c57f398fded5f/mail/components/extensions/parent/ext-tabs.js#67 

```javascript
  awaitTabReady(nativeTabInfo) {
    let deferred = this.tabReadyPromises.get(nativeTabInfo);
    if (!deferred) {
      deferred = PromiseUtils.defer();
      let browser = getTabBrowser(nativeTabInfo); <= HERE!
```

The function `getTabBrowser()` looks return `null` on Thunderbird.
Revision 1 by
on 
This problem doesn't happen on Firefox.

On my environment, `tabs.executeScript` raises an error in the debugger console for the testcase addon:

```
can't access property "innerWindowID", browser is null ext-tabs.js:70
    awaitTabReady chrome://messenger/content/parent/ext-tabs.js:70
    promiseTabWhenReady chrome://messenger/content/parent/ext-tabs.js:272
    executeScript chrome://messenger/content/parent/ext-tabs.js:538
    executeScript self-hosted:935
    result resource://gre/modules/ExtensionParent.jsm:930
    withPendingBrowser resource://gre/modules/ExtensionParent.jsm:485
    result resource://gre/modules/ExtensionParent.jsm:930
    callAndLog resource://gre/modules/ExtensionParent.jsm:892
    recvAPICall resource://gre/modules/ExtensionParent.jsm:929
    AsyncFunctionNext self-hosted:684
```

The error is raised from https://searchfox.org/comm-central/rev/1598a3b8368c0b823505889ddd1c57f398fded5f/mail/components/extensions/parent/ext-tabs.js#67 

```javascript
  awaitTabReady(nativeTabInfo) {
    let deferred = this.tabReadyPromises.get(nativeTabInfo);
    if (!deferred) {
      deferred = PromiseUtils.defer();
      let browser = getTabBrowser(nativeTabInfo); <= HERE!
```

The function `getTabBrowser()` looks to return `null` on Thunderbird.

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