A new window opens with the home page(s).

You can check the home page setting:

• Tools > Options > General > Startup: Home page
• https://support.mozilla.org/kb/How+to+set+the+home+page

Firefox supports multiple home pages separated by '|' (pipe) symbols.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox profile folder that store session data.

Rename (or delete) the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Multiple_profile_files_created

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).

correct, case closed.

This is an oversight by the developers of the latest FireFox revision: a great shame, as the overall feel of the browser has patently been improved.

Xabolcs has come up with a nice fudging idea; if it were to work; but sadly it doesn't for me....

As mentioned, the latest version of FireFox (May'14) now opens one's "homepage" instead of a new blank window. As my "homepage" is almost a dozen tabs; this is worse than useless. It's like starting FireFox again; and then having to close a whole string of unwanted tabs!

To compound my frustration, the "move to a new window" option disappeared on another recent FireFox "upgrade"; but I managed to get round that by copying an url from a tab, then opening a new blank window, to paste the url into.

So, is there any possible way to open a new window in this latest version of FireFox?

I just want to be able to open a new FireFox window; and I'd be happy with it being either blank, or duplicating the url of a currently-showing tab. But preferably both options should be available.

This would allow view of one trimmed-size webpage in front of another one, showing in a selected tab in my normal-use multi-tab window: useful when comparing complex images, for example.

Meanwhile, if the developers are watching out for feedback..................................... please sort this, by putting back at least one of these:

"open a new blank window" or "move page to new window"

After all, I do NOT want to have to use Gugl-Krohm!

Firefox has always opened a new window the the home page(s), so that is not a recent change.

Easiest to open a blank window is to create a bookmark with the location set to about:blank on the Bookmarks Toolbar and hold down the shift key and left-click this bookmark.

You can tear off a tab by dragging the tab slightly down in the browser window and that tab will be opened in a new window.
This is the same as the "Move to New Window" item that you have in the right-click context menu of a tab on the Tab bar.

I'll concede that I may be remembering the "open new window" (drop-down menu) option; giving me a single tabbed window; from the days before I had a multiple-tab home-page.

But the bookmarked blank window idea is inconveniently complicated: at my age, it is difficult to remember new command sequences: even if I thought that bookmark suggestion would save any appreciable time....

Also I can't get the "dragging the tab slightly down" suggestion to work at all: only some rearrangement of the tabs' order, left-to-right.

Thirdly, you refer to a "Move to New Window" item, claiming it is there in the right-click menu from a tab. This illustrates that you missed the point of my complaint: it ain't there!

There is NO "move to new window" or "open in new window" option

So my question remains: why-oh-why did the developers decide to drop this "open (current page) in a new window"????? It was working fine before: so why did they "fix" it???

We mere mortals need a drop-down menu option that's simple: not some clever shortcut, with-holding a shift key whilst balancing our three braincells on a slippy pogo stick!