Bug: Pile of "Attempt to override an existing message: "downloads-window", "downloads-*" from browser/downloads.ftl in the browser console when opening the library window
Status: RESOLVED
Priority: --
Resolution: FIXED
Created: 2021-10-01 21:48:51+00:00
Resolved: 2022-02-13 22:07:44+00:00

STR:

1. open Firefox
2. open browser console
3. open library (ctrl/cmd-shift-o in the main browser window)

Full list:

```
Attempt to override an existing message: "downloads-window". browser/downloads.ftl
Attempt to override an existing message: "downloads-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-panel-list". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-pause". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-resume". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-cancel". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-cancel-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-show-menuitem". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-show-menuitem-mac". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-use-system-default". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-always-use-system-default". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-show-button". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-show-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-show-description". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-show-downloads". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-retry". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-retry-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-go-to-download-page". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-copy-download-link". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-remove-from-history". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-clear-list". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-clear-downloads". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-unblock". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-remove-file". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-remove-file-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-choose-unblock". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-choose-unblock-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-choose-open". browser/downloads.ftl
Attempt to override an existing message: "downloads-cmd-choose-open-panel". browser/downloads.ftl
Attempt to override an existing message: "downloads-show-more-information". browser/downloads.ftl
Attempt to override an existing message: "downloads-open-file". browser/downloads.ftl
Attempt to override an existing message: "downloading-file-opens-in-hours-and-minutes". browser/downloads.ftl
Attempt to override an existing message: "downloading-file-opens-in-minutes". browser/downloads.ftl
Attempt to override an existing message: "downloading-file-opens-in-minutes-and-seconds". browser/downloads.ftl
Attempt to override an existing message: "downloading-file-opens-in-seconds". browser/downloads.ftl
Attempt to override an existing message: "downloading-file-opens-in-some-time". browser/downloads.ftl
Attempt to override an existing message: "downloads-retry-download". browser/downloads.ftl
Attempt to override an existing message: "downloads-cancel-download". browser/downloads.ftl
Attempt to override an existing message: "downloads-history". browser/downloads.ftl
Attempt to override an existing message: "downloads-details". browser/downloads.ftl
Attempt to override an existing message: "downloads-clear-downloads-button". browser/downloads.ftl
Attempt to override an existing message: "downloads-list-empty". browser/downloads.ftl
Attempt to override an existing message: "downloads-panel-empty". browser/downloads.ftl
```

(from mid-mozregression, might look slightly different on current Nightly)

It's not clear to me what is causing these messages, or why they haven't broken anything on infra, or how to fix it, because frankly the messages are not very descriptive. (What is doing the attempt/overriding? Why is it an error? It just points to a file, no line number, and doesn't indicate where the conflict is or how to resolve it.)

Zibi, this broke with your changes in bug 1613705 ([regression window](https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=ff220475fee8b11104548853a74b021a1718f47e&tochange=120f83c79d5c22ea8cf344bd901de79333dc035b)), can you clarify what is going on here?