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There's no advantage to running Firefox in 64-bit. It uses more memory and doesn't benefit from the 64-bit instructions. As you discovered, it also causes compatibility issues. There are really only a few conditions where 64-bit is of value (4GB+ RAM, video encoding, some scientific apps, some graphics apps). You want to use Firefox in 32-bit only. These issues are usually why I recommend installing 32-bit distributions on x86_64 CPUs for most folks.
I'm now running 2GB RAM, dual channel. It would be easy for me to upgrade the RAM to 4GB. RAM is economical nowadays.
I don't game nor do/run video encoding/scientific apps/graphic editing. What will be the advantage running 64bit OS paying money to upgrade the PC?
At 4GB, some machines (depending on the chipset) will see about 3.4GB in 32-bit mode. To regain the additional memory, you need to run in 64-bit mode. However, it's really of little value, as all addresses/pointers double in size in 64-bit mode, reducing the available memory. Above 4GB, 64-bit should be used. However, unless you frequently run multiple virtual systems, it sounds like you have little need for the additional RAM.
The performance can actually be lower in 64-bit mode, as applications are larger, take more I/O to load and they use more memory which can put pressure on cache. This is offset somewhat by having additional registers, but not noticeably for most applications.
I have a machine that does automated image capture, processing and video encoding. That machine benefits from an x86_64 distribution, but my other machines (used as desktops) do not.