15.0.1 upgrade if you move a tab to a new window the tab disappears (& you can't move it back) plus if you open a new tab it overwrites the first
When you drag a tab off one window in firefox to start a new window, this new window appreas without a 'proper' tab - that means there's no way to drag the tab back if you want to re-merge it with the original window. It also means that when you click on the + in the new window to create a second tab, it just overwrites the original tab (and URL) so you lose it completely. FF used to do this all fine befor the last upgraged
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Did you check the Tab preferences?
- Firefox > Preferences > Tabs: [X] "Always show the tab bar"
Thanks for your answer - but that was already set, in fact, all options in that preference window are ticked.
Any luck with disabling some new window features?
- http://kb.mozillazine.org/Prevent_websites_from_disabling_new_window_features
- http://kb.mozillazine.org/JavaScript#Advanced_JavaScript_settings
You can also check for problems with the localstore.rdf file.
Try to remove the Firefox plist file (org.mozilla.firefox.plist).
- http://www.macfixit.com/article.php?story=20060606082246983 How .plist files become corrupt and troubleshooting the results
Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)
Изменено cor-el
Cor-el, thanks very much for your comprehensive reply - I tried all of those but no luck. Actually, apparently there are no plist files for macs created by firefox (see: here and several other mentions about this elsewhere).
In the end, I've solved this by uninstalling all of my add ons and extensions (firebug, colorzilla etc), wiping firefox from my mac and doing a clean install to 16.0.1.
Thanks to both of you who answered my query.