Pale Moon Planned system requirements changes this year

[Corrine]

Although the requirements for 32bit Windows systems will remain unchanged, following are the planned changes from the Pale Moon announcement:

For 64-bit on x86 hardware, we will move from a minimum requirement of a CPU with SSE2 support, to one that supports at least the AVX instruction set. In Intel terms, this means x86_64 v2 + AVX.
Any desktop Intel CPU released after approximately 2011 (Intel Sandy Bridge or later), and any desktop AMD CPU released after approximately 2013 (AMD Bulldozer or later) should support AVX. Some users have indicated that particularly low-power mobile CPUs have lagged behind in their support for AVX a little (Some 10W Celerons, for example) so if you are running a particularly low-end CPU or laptop, you may want to double-check. If you are unsure, you can use e.g. CPU-Z on Windows to see what your CPU supports. Linux and other operating systems may have tools available inside the distribution itself to query CPU capabilities; please check your documentation (or community fora) if you need help.
For some alternative operating systems that would normally run on much older hardware (e.g. Solaris/Illumos), we may continue using an SSE2 baseline. Please check your maintainers' information if this is the case or not. It is expected that all our main distribution channels follow this requirement change, though, i.e. Windows, binary Linux from our website, and package distributions for major Linux distributions (Debian/Ubuntu/etc.)

If your Windows CPU is too old, you can uninstall the 64bit version of Pale Moon and install the 32bit version.  Linux users will need to check if your distro is planning to make less optimized community builds available.