Sure
@article{woolley2015collective,
title={Collective intelligence in teams and organizations},
author={Woolley, Anita Williams and Aggarwal, Ishani and Malone, Thomas W},
journal={Handbook of Collective Intelligence},
pages={143--168},
year={2015},
publisher={MIT Press}
}
You are correct re: the Zotero process. Once I killed the process the dialog boxed disappeared.

Hi, I have more or less the same bug, trying to import a reference from Google Scholar. In the former version of Zotero embedded in firefox, I did it selecting "cite" in G scholar and then "End note". This doesn't work anymore and all I get is a running window "Importing", without result. Is here now another way to import a reference?
Thanks in advance. Michel-Jean

Just reproduced it. The error message I get is:

An error occurred while trying to import the selected file. Please ensure that the file is valid and try again.

And the debug output is the following (I truncated bits that seemed less important to make it fit here):

[JavaScript Error: "The connection was refused when attempting to contact wss://stream.zotero.org/."]

[JavaScript Error: "WebSocket connection closed: 1006 "]

[JavaScript Error: "The connection was refused when attempting to contact wss://stream.zotero.org/."]

[JavaScript Error: "WebSocket connection closed: 1006 "]

[JavaScript Error: "XML Parsing Error: not well-formed
Location: moz-nullprincipal:{f777d48c-90e4-4ebd-b458-cde8a8a68ad9}
Line Number 1, Column 1:" {file: "moz-nullprincipal:{f777d48c-90e4-4ebd-b458-cde8a8a68ad9}" line: 1 column: 1 source: "@article{woolley2015collective,"}]
...
(3)(+0000000): WebSocket error

(1)(+0000001): WebSocket connection closed: 1006

(3)(+0000000): Delaying 15000 ms

(4)(+0003261): Translate: Binding sandbox to http://www.example.com/

(3)(+0000010): Getting contents of /home/jeremy/Zotero/translators/Bibliontology RDF.js

(4)(+0000011): Translate: Parsing code for Bibliontology RDF (14763d25-8ba0-45df-8f52-b8d1108e7ac9, 2017-06-04 14:50:00)

(3)(+0000003): Translate: Initializing RDF data store
...
(3)(+0000005): Translate: [better-bibtex:BetterBibTeX JSON] "BetterBibTeX JSON.detect failed:"

...
(2)(+0000002): Translate: Detect using RDF failed: string => Error: XML known invalid stack => Error: XML known invalid init@chrome://zotero/content/xpcom/translation/translate.js:2792:10 Zotero.Translate.Import.prototype._loadTranslatorPrepareIO<@chrome://zotero/content/xpcom/translation/translate.js:2310:2 tryCatcher@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/util.js:16:16 module.exports/Promise.method/<@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/method.js:15:21 From previous event: captureStackTrace@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/debuggability.js:826:23 CapturedTrace@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/debuggability.js:718:5 longStackTracesCaptureStackTrace@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/debuggability.js:397:19 module.exports/Promise.prototype._then@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/promise.js:232:9 module.exports/Promise.prototype.then@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/promise.js:125:12 _detect@chrome://zotero/content/xpcom/translation/translate.js:1705:3 complete@chrome://zotero/content/xpcom/translation/translate.js:1531:5 Zotero.Translate.Import.prototype.complete@chrome://zotero/content/xpcom/translation/translate.js:2251:2 decrementAsyncProcesses@chrome://zotero/content/xpcom/translation/translate.js:1073:4 _detectTranslatorLoaded@chrome://zotero/content/xpcom/translation/translate.js:1730:3 _detect/<@chrome://zotero/content/xpcom/translation/translate.js:1707:11 tryCatcher@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/util.js:16:16 module.exports/Promise.prototype._settlePromiseFromHandler@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/promise.js:512:13 module.exports/Promise.prototype._settlePromise@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/promise.js:569:13 module.exports/Promise.prototype._settlePromise0@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/promise.js:614:5 module.exports/Promise.prototype._settlePromises@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/promise.js:693:13 Async.prototype._drainQueue@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/async.js:133:13 Async.prototype._drainQueues@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/async.js:143:5 Async/this.drainQueues@resource://gre/modules/commonjs/toolkit/loader.js -> resource://zotero/bluebird/async.js:17:9 url => undefined downloadAssociatedFiles => true automaticSnapshots => false
...
(3)(+0000040): Translate: [better-bibtex:Better BibTeX] "BBT detect against @article{woolley2015collective,\ntitle={Collective intelligence in teams and organizations},\nauthor={Woolley, Anita Williams and Aggarwal, Ishani and Malone, Thomas W},\njournal={Handbook of Collective Intelligence},\npages={143--168},\nyear={2015},\npublisher={MIT Press}\n}"

(3)(+0000015): Translate: [better-bibtex:Better BibTeX] "better-bibtex: detect: true"

Yes, it's from the BBT translators that are still installed. Reset your translators from the Advanced → Files and Folders pane of the Zotero preferences.