Jonas Jenwald 8a349801dc [Firefox viewer] Stop using FirefoxCom.requestAsync in the DownloadManager
After the changes in https://bugzilla.mozilla.org/show_bug.cgi?id=1757771, that simplified the MOZCENTRAL downloading code, the `ChromeActions.download`-method will no longer invoke the `sendResponse`-callback.
Hence it should no longer be necessary for the `DownloadManager`, in the MOZCENTRAL viewer, to use `FirefoxCom.requestAsync` since no response is ever provided.[1] For the allocated BlobURLs, they should (hopefully) be released when navigating away from the viewer.

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[1] Note that that was *already* the case, for one of the previous code-paths in the `ChromeActions.download`-method.
2022-05-15 18:18:37 +02:00
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