[For Developers]Tricks when developing & debugging

[PikachuEXE]

The use of shortcut

I have just encountered a bug that is caused by the use of shortcut
Code:

called earlier: var _tabInnerBox = gbrowser.abc(Private member)

called later: var scrollbar = _tabInnerBox.def

scrollbar becomes undefined!!!
But if you use this, it will give you the correct one:
gbrowser.abc.def

So when you are debugging, make sure you test the code without using shortcut first!!

[PikachuEXE]

Tips from rejection after review:

1) The use of eval is deprecated for security reasons and a safer alternative is required (https://developer.mozilla.org/en/XUL_School/Appendix_C:_Avoid_using_eval_in_Add-ons).

Also,

2) Variables referencing function names are deprecated, instead anonymous functions are used with setTimeout and setInterval, i.e. setTimeout(doSomething) → setTimeout(function () { doSomething(); }).

[PikachuEXE]

midWidth of tabs can only be changed though overwriting & manipulating CSS rules
Although the API for styles still exists it doesn't work
FF4+ change is really big...

[PikachuEXE]

Some namespace would become undefined (lost?deleted?) after a browser window is closed
Some errors might be generated after that
Such as
PlaceUtils (module)
getTopWin (a funciton in utils.js)