With such low RAM (1 GB) then LATEST firefox (104.0 or 106a1, etc) is near useless for you (IMHO).
I have a functional Dell Mini 10 (1 GB RAM, 16 GB HDD, CPU Atom N20, from year 2008) and with Firefox 85 is slow/annoying to watch movies from you-tube etc. [become stupid google codification/de-compression is too demanding for my CPU; google save time/money/energy in speed transfer but cost your CPU/GPU to uncompress the movie].
BTW, for testing:
1. just grab the firefox dependecies (tce-load -iw gtk3.tcz ffmepg4,tcz pavcontrol.tcz) from TC servers / mirrors;
2. then MANUALLY download any firefox virgin from Mozilla site. So we talk about 70-120 MB download gz, which will extract in 170-240 MB.
3. Then you can run it directly, the usr/bin/firefox.
Or else just grab the firefox ESR edition (ready made for you) from tc servers.