Upgraded Standalone and now Zotero won't work in Firefox
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You can downgrade to Zotero Standalone 4.0 and Zotero 4.0 for Firefox, of course, but we can't provide support for those anymore, and using an outdated, insecure browser version is a very bad idea, particularly when there's no need to.
We'll try to figure out what happened during the upgrade, since obviously this should work smoothly.
https://www.mozilla.org/en-US/firefox/organizations/
Again, there's also a difference between legacy add-ons and unsigned add-ons. The former will all still work in 52 (barring some other random incompatibility). If any of your extensions aren't signed, you'd have to use the unbranded build of Firefox. But if they're on addons.mozilla.org (and generally even if they aren't, unless they're abandoned by their developers) they'd be signed.
Should I now delete the Zotero folder from my Mozilla Profile?
Who is it for?
Firefox ESR is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses.
Who is it not for?
Individual users who always want the latest features, performance enhancements and technologies in their browser without waiting for them to become available in ESR several development cycles later.
Step 1.
Before proceeding, we strongly encourage Firefox ESR users to sign up for the Enterprise Working Group (EWG) mailing list. The EWG list is a great place to discuss deploying Firefox with other community members and will be the only way to receive regular communications regarding product updates and support.
Step 2.
Review our handy FAQ for your organization and download Firefox ESR.
Again, you can run either the ESR — which is perfectly fine for individual users to run — or the current Firefox version, currently 54. Most people should run the current version. If you still want to keep running legacy extensions past Firefox 57, which will be released later this year, you can run the ESR until mid-2018.
It's entirely your choice, but I've provided all the information you need to continue, and I can't help you further.
Could this be a problem if I don't even see the Zotero Connector in my menu taskbar?
If you're running some legacy extension that modifies the toolbar, that could be interfering, so you could try with other extensions temporarily disabled.
http://i.imgur.com/PQtUvAg.jpg
No go on that "Zotero is Offline
The Zotero Connector was unable to communicate with the Zotero desktop application. The Connector can save some pages directly to your zotero.org account, but for best results you should make sure Zotero is open before attempting to save.
You can download Zotero or troubleshoot the connection if necessary."
https://www.zotero.org/support/getting_stuff_into_your_library#web_translators
https://www.zotero.org/support/getting_stuff_into_your_library#saving_webpages
There's no more Z button. When you first install the Connector, the save button will show a Z until you first click on it and get a welcome message. If it's a Z any other time, something isn't working right, likely because of other extensions you have installed that are interfering or a known issue with strict privacy settings (which we hope to have a fix for soon).
Zotero is now a separate application, so yes, you should keep it open while you save to it for best results. Otherwise this works almost exactly the same as it did before.
http://i.imgur.com/VJLk81z.jpg
http://i.imgur.com/HEtXBFU.jpg
Jake