Using the TenFourFox preference pane

The TenFourFox preference pane controls features specific or useful for TenFourFox users. Some of these features are unique to TenFourFox. You should be using at least version 45.6 or later. Not all options appear in earlier versions of the browser.

To access the prefpane, go to the TenFourFox pull-down menu, select Preferences..., and in the new tab that opens click the TenFourFox tab on the left.

The MediaSource option controls whether MediaSource Extensions (MSE) are enabled.

  • MSE allows the use of the more advanced VP9 video codec and allows sites to monitor and upgrade or downgrade your video quality dynamically, and may offer more video resolution options on certain sites such as YouTube. However, VP9 requires more computing resources to decode, and sites may select viewing resolutions your computer cannot handle. If this option is not checked, MSE is disabled, and the lower bitrate but faster VP8 codec is used instead.

  • In general, very fast Power Macs and very slow Power Macs should use MSE; fast G5s can display in higher resolutions, and very slow Macs may have low bitrate options like 144p that are not available without MSE. Machines in the midrange, such as last-generation G4 systems, iBooks and PowerBooks, often should not.

  • Here is more information about the best option for your system.

The PDF Viewing option controls whether the built-in PDF viewer is used.

  • If this option is checked, TenFourFox uses a built-in PDF viewer. This viewer is written in JavaScript and is designed to be safer when viewing PDFs from unknown sources, but does not support many PDF features and may display certain documents incorrectly. It is also slower than or Adobe Acrobat.

  • If this option is unchecked, TenFourFox will usually offer to download the document, after which you can open it with, Acrobat Reader, or other tools. This will display the document more quickly and correctly, but note that the document is not scanned for malware or other attempts to exploit flaws in the viewer, so it should not be used to view documents from unknown or suspicious sources.

The User Agent option controls how the user agent, the string the browser uses to identify itself, is set. This can affect how certain sites interact with the browser and what features they enable.

  • If the default is selected, the default user agent for previous versions of TenFourFox is used, which is modeled on Firefox. It also includes the current build version as a token. Most sites will work fine with the default.

  • The Firefox (Intel) option makes your Power Mac appear to be an Intel Mac running Firefox, and carries no TenFourFox identification. This is most useful for banks and other secure sites which only claim to support certain specific browsers.

  • The other options may be useful for compatibility or performance on some sites. For example, the Classilla option uses the same user agent as the Classilla browser, which was specifically selected to prefer lightweight mobile content. This would be a good choice for a G3 system, for example.

  • If at all possible, use the default option (TenFourFox); the others may cause sites to enable features the browser doesn't yet support or disable features that would otherwise work properly.

  • Some sites, such as the TenFourFox Start Page, can determine you are using TenFourFox no matter what you have chosen for this setting.

If you're not sure what these settings do, open a ticket on Tenderapp and we can help you.