Firefox initially opens new tabs as tabs, then switches to new windows

I am running FF 14.0.1 and the following problem has persisted through a number of versions.
Initially FF will open new tabs...Ctrl+t works, right-click open in new tab etc. all work fine. Sometimes tabs are now issue and I can have maybe 20 or more tabs open. Then other times we seem to get to some arbitrary limit, say 5 tabs, and from then on every new tab opens a new window. Any external link opens in a new window, a Ctrl+t opens as a new window, all new windows are single frame, e.g. you can't have a number of windows each of say 5 tabs, just the original window with (say) 5 and then a series of windows with only single pages in each and from which Ctrl+t only opens a new window.
A complete restart does sometimes cure things and I can go back to having different pages in different tabs, and then something...no obvious pattern...kick us into 'new window only' mode after which even if I reduce the number of tabs in the original multi-tabbed window, Ctrl+t only opens new windows.
It's really starting to get to me... I've trawled the support info and am wondering about a complete reset or even uninstall and re-install. places.sqlite is checked as being valid and I've reindexed it too, all to no effect.

Well I think the following shows the odd state FF has got itself into. So I...
# Located the profile folder
# Closed FF (14.0.1)
# Renamed (rather than deleted) the localstore.rdf file
# Restarted FF in safe mode
The main point then was that excepting the change in layout, that tabs didn't work at all; the option was greyed-out, the + tab did nothing and Ctrl+t did nothing.
The then stopped, deleted the new localstore.rdf and restored the old/orginal one and restarted. This restored my layout by still new tab is entirely gone...the option is greyed-out in the menus, the + tab dodn't work and Ctrl+t does nothing. Ctrl+n does give a new window. In addition:
# The forward and back buttons have disappeared
# The toolbars have disappeared despite showing as enabled in the View:Toolbars menu
Opening a new windows however give a correct layout, e.g. back and forward and toolbars appear and New tab is enabled, however, it either via menu of via Ctrl+t only opens new windows.
The start in Safe mode sadly didn't seem to help, but I will experiment further...
Images:
# Note the loss of back and forward buttons and no toolbar
# This is simply a Ctrl+n new window...back and forward arrows and toolbars restored
# This is in the 'parent' multi-tabbed window (with no back/forward etc.). Note how New tab is greyed out explaining why + tab and Ctrl+t simply doesn't work...doesn't open new window, simply does nothing at all

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