Hello booya, From a quick search I am not sure if there is such an open bug. Can you say what the bug number is for the bug you were looking at.

Incidentally have a look at the troubleshooting information page. An easy method of opening that is: Key about:support in to the addressbar and press Enter

• See also Use the Troubleshooting Information page to help fix Firefox issues
  Use the Troubleshooting Information page to help fix Firefox issues

Have a look for the preference "Multiprocess Windows" what is the number value alongside that ?

Could you provide a fuller description of the problem. For example, you have a tab open in a window and the tab says, for example, Yahoo, and when you move the tab to a new window, what does it say now?

Hello and thanks for the answers!

John99, I could be mistaken by thinking that this is a known bug :(

But "Multiprocess Windows" says - 1/1 (enabled by user). This is what you asked for? Or I can search for another parameter.

jscher2000, you are right :) I have now a few tabs opened. Inluding this page. Now I will open a new tab with e.g. Yahoo. It will be called Yahoo. Than I'll switch back to support.mozilla.org page and the name of this tab will be Yahoo :( If I'll switch deeper to the left (another tabs), the name of active tab will be the same - Yahoo.

OK that sounds like a bug. You can submit a bug report and see what comments you get:

https://bugzilla.mozilla.org/enter_bug.cgi

As you enter the description, the system will check for duplicates. Sometimes that will lead you to an existing discussion where you can vote for the bug to get fixed or contribute technical insights. ("Me too" comments are generally not helpful, however.)

• Bugzilla Etiquette
• Voting
• Bug writing guidelines

I did find this plus about a dozen duplicates:

• Bug 1087966 - e10s - Tab drag to new window results in incorrect "New Tab" tab title and a largely broken tab

but

• It was shown as fixed way back in Fx39
• It relates to multi process Firefox (Code words Electrolysis or E10s)

I have not tried to reproduce this yet. Neither have I tried very hard to find current open bugs, I have not got the spare time right now.

• You will be able to turn off E10s and that may solve the problem
  • See https://wiki.mozilla.org/Electrolysis#Firefox_Release
• E10s is turned on as a test forl less than 1% of users of the Fx48 Release. Sounds like you are part of that test.

The article I lnked to gave instructions for enabling E10s

Firefox Release If you're using Firefox 48 or later, you might be using e10s already. Check about:support and look for a number higher than 0 in the "Multiprocess Windows" entry. If you would like to opt-in, open about:config and toggle browser.tabs.remote.autostart to true. On your next restart, e10s should be active.

You will need to do the reverse of that and toggle the value to false. You open about:config by keying in to the address bar about:config pressing Enter and accepting any warning.

• See http://kb.mozillazine.org/About:config

Key in to the search box tabs.rem and it should find that pref for you. Right clicking will allow you to toggle it. You probably need to restart to enable that.

I have not actually tried that in Release Fx48 yet, and guess I would need to use a new profile or use the force enable method.

• https://wiki.mozilla.org/Electrolysis#Force_Enable