This is more of a report than a question. "Share this page" doesn't work for me in FF45.0.2 with "Tab Mix Plus" enabled. It gives "Firefox is unable to connect with Twitter right now" message. Similar fail for Google+. Repeatable and consistent; TMP enabled, Firefox's "Share this page" service (or activations; the stuff at https://activations.cdn.mozilla.net/en-US/) doesn't work, TMP disable, FF Share this page does work. Workaround: Don't use Firefox services. Tab Mix Plus is much more valuable. There are plenty of other ways to share pages. This failure and error message is happening to other people not as a result of Tab Mix Plus, as in the thread at https://support.mozilla.org/en-US/questions/1108340. Also reported at https://plus.google.com/117650434941144976783/posts/VsxVenTczPd And at https://www.reddit.com/r/firefox/comments/4elafv/i_keep_getting_firefox_is_unable_to_connect_with/ And at http://blog.gmane.org/gmane.comp.mozilla.nightly/month=20151201 Might relate to a regression re this bug Bug 1188378 - Tracking protection breaks share (Twitter specifically) https://bugzilla.mozilla.org/show_bug.cgi?id=1188378 I had tracking protection, mention in the Bugzilla report, turned on.