The first of the 'Feature Parity Releases,' or FPRs, in which major later Firefox features were backported to TenFourFox's modified Firefox ESR 45 base, was released after the official end of Firefox ESR 45 support on June 13, 2017. In December 2015, Kaiser declared TenFourFox would move away directly from Firefox source code with 45 ESR, citing an inability to port later versions due to operating system and Rust compiler limitations. Only minor ESR updates were advertised as suitable for general consumption. Between major ESR versions, developers tracked changes in Firefox's 6-week rapid release cycle with test builds only to determine whether or not they would still be able to build the software after the next ESR version was released. After Mozilla announced the extended support release (ESR) of Firefox, Cameron Kaiser stated that starting with version 10 of TenFourFox, stable releases of TenFourFox will be based on Firefox ESR to reduce maintenance burden. TenFourFox is a great piece of software, but I get annoyed when I see the CPU usage jump to 100 literally doing something as simple as moving the cursor over a webpage, and page loads are quite. Version 5.0 switched to the current Mozilla rapid release framework, based on Firefox 5 and including additional AltiVec scaling and color features, and was released on June 16, 2011. The status light doesn't come on and in about 10 secs the application quits. TenFourFox browser crashes (quits) when I try to print in it. The finalized first release version, 4.0s, incorporated a security update and a fix for JavaScript performance, and was released on March 24, 2011. I'm using an HL-5370DW on a Mac G5 PPC with OSX 10.5.8. More about that when the beta is out, which I'm hoping to do by the middle-end of July. Sleeping the Power Mac pauses everything, so the cruft in memory that garbage collection has to clean out doesn't pile up while you're not using the machine, and everything comes back up in sync. (This is why running TenFourFox from a 'fresh' start is much faster than when it's been chugging away for awhile.) It's possible to 'pause' TenFourFox to a certain extent but the browser really isn't tested this way and may not behave properly when this is done. If you have lots of tabs open and those tabs are refreshing their data or otherwise running active content, then this contributes to a greater need for garbage collection and this will slow down your user experience as this overhead accumulates. Not only does by reducing heat (another plus in summer) as well as saving a substantial amount of energy (around 20W sleeping versus 200-250W running), but sleeping also can speed up TenFourFox.
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