1. The speed is acceptable if either width or height is set to some low value (eg. 10-200) this way: getmaxcanvassize('height', 20). But if called without width or height like getmaxcanvassize, the created canvas is so big that reading SINGLE pixel color is very slow, and in IE causes serious hang.
2. Firefox would open and by doing so, change its window size so that a small gap was left at the bottom of the browser window and the Windows taskbar. While it is easy enough to make the browser fit the space, e.g. By dragging its window to the left side of the monitor to have it expand automatically, it was something that left me puzzled.
3. Possible values and their effects This integer preference takes values between 1 and 65535 inclusive, directly corresponding to the maximum number of HTTP connections Mozilla can have open at once. The default value is 24 for all applications except Minimo, whose default is 2. In Firefox 3, the default has been raised to 30.

From MozillaZine Knowledge Base

CCS Max is compatible with Firefox v56 and Greasemonkey v3.10†. NOT COMPATIBLE WITH FIREFOX v57! We're looking into making it compatible but will take a few weeks if not more. In the meantime, CCS Max for Google Chrome is a good alternative - just added a new feature for FA RESV POOL page.

Background

“[JavaScript] that executes for whole seconds is probably doing something wrong...” says Brendan Eich, creator of JavaScript. When a script is executing, Mozilla's UI will be unresponsive until the script’s thread ends. Correspondingly, Mozilla will alert you when a script is taking a long time to run and let you stop the script. This preference lets you define what “a long time” is.

Possible values and their effects

The value is a positive integer, determining the number of seconds of execution before warning. 0 and negative values are considered 'forever.' (Default value is 10; 5 in versions prior to nightly builds dated 2006-07-27) (bug 335058)

Previous effects

In builds prior to 2005-10-11, values less than 0 were assumed to be the default (then, 5). In builds prior to 2006-07-27 (e.g., Firefox 1.5), this preference affected scripts running in content and chrome; the limit on scripts running in chrome is now determined by dom.max_chrome_script_run_time.

Caveats

• This preference was not dynamic (i.e., only read at startup) until 2005-10-11. The new dynamic behavior is available in Firefox and Thunderbird versions 1.5 and later, and in all versions of SeaMonkey.
• This preference was subject to some bugs (see below) that made the true time limit somewhat unpredictable for certain scripts.

Recommended settings

If you’re encountering the “A script on this page is causing Mozilla to run slowly” dialog often and you’d like to disable it, setting this preference to 0 will allow the script to run for as long as it needs. A large number may be more appropriate, though, to avoid locking the entire UI forever as the script executes.

First checked in

Has an effect in

• Mozilla Suite (all versions since 1.7a)
• Mozilla Thunderbird (all versions since 0.6)
• Camino (all versions since 0.8b)
• Mozilla Firefox (all versions since 0.9)
• SeaMonkey (all versions)

Related bugs

Related preferences

This article explains how to download and install Firefox on a Mac.

• If you are updating from a previous version of Firefox, see Update Firefox to the latest release.

If you use an old version of OS X, see these articles for more information:

To download and install Firefox:

1. Visit the Firefox download page in any browser (for example, Safari). It will automatically detect the platform and language on your computer and recommend the best version of Firefox for you.
2. Click .
   • Note: If you want to have a choice of the language for your Firefox installation, click the Download options and other languages link instead.
3. Once the download has completed, the file (Firefox.dmg) may open by itself and pop open a Finder window containing the Firefox application. Drag the Firefox icon on top of the Applications folder in order to copy it there.

   Note: If you do not see this window, open the Firefox.dmg file that you downloaded.

4. After dragging Firefox to the Applications folder, hold down the control key while clicking in the window and select Eject 'Firefox' from the menu.

Firefox Maxilla

Tip: You can add Firefox to your dock for easy access. Just open your Applications folder and drag Firefox to the dock.

Firefox is now ready for use. Just click on its icon in the dock or Applications folder to start it.

Firefox Max Size

When you first start up Firefox, you will be warned that you downloaded Firefox from the Internet. Because you download Firefox from the official site, click .

Firefox Maximize Window

Upon installation, Firefox will not be your default browser, which you'll be notified about. That means that when you open a link in your mail application, an Internet shortcut, or HTML document, it will not open in Firefox. If you want Firefox to do those things, click . If you're just trying out Firefox or simply do not wish to set Firefox as your default browser, click .