I am still faffing around with FireFox see click here For me the version that works with all the bells and whistles is 2.xx.x From there on 3.xx up it works but lacking in certain attributes . For example Book marks- the Book Marking element simply does not work - will not record 'New' marks and cannot find the old marks- Though they are still in the machine- because when V.2 is reloaded - there they all are.
In V3. the top Bar is deficient in certain elements - for example the forward back arrows are absent- yet- revert and there they all are.
This missive is being compiled in Explorer - long time since I have used it. So enlightenment some one Is a 'program' [not only FF but any program] a complete entity or is it a bundle of 'patches' to that simple reorganizes what XP[for example] has already in its library?
Depends a lot on the program, some are designed in a modular form, so that specific components of the program perform functions within the remit of the entire package. These can be tweaked or rewritten without hopefully banjaxing the entire shebang. Others are less forgiving, one syntax error and the whole thing goes belly up.