Investigate "filenameTitle is undefined"

[ianb]

In this Sentry report:

get filename@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/build/shot.js:349:5
exports.downloadShot/<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/shooter.js:157:7
promise callback*exports.downloadShot@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/shooter.js:156:26
download@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:132:7
display/this.download.onclick<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/ui.js:396:11
assertIsTrusted/<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/assertIsTrusted.js:17:12
watchFunction/this.catcher@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/catcher.js:52:16
EventHandlerNonNull*display@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/ui.js:394:33
mouseup@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:650:7
addHandlers/</fn<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:867:18
watchFunction/this.catcher@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/catcher.js:52:16
watchFunction/this.catcher@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/catcher.js:52:16
EventListener.handleEvent*installHandlersOnDocument@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:883:7
display/this.ui</this.element.onload<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/ui.js:103:13
watchFunction/this.catcher@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/catcher.js:52:16
EventHandlerNonNull*display/this.ui<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/ui.js:95:33
display@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/ui.js:81:14
display@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/ui.js:323:14
start@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:374:20
setState@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:192:7
exports.activate@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:821:7
this.uicontrol<@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:924:3
@moz-extension://769a0721-7d97-4131-a1c1-5e0c0d93be00/selector/uicontrol.js:6:19

Maybe caused by a page that has no identifiable title of any sort? That should default to the URL in some fashion.