The final push to start using Firefox over Chrome on Android might finally be thanks to the enormous selection of add-ons (Firefox’s version of extensions) coming out next month. Chrome doesn’t offer native support for extensions in its mobile app. Also, better security.
I am using a plug-in on my pc
What he means is the native off-line translation feature that Firefox now has on PC, you don’t need a plugin for it: https://news.itsfoss.com/firefox-118-release/
AFAIK it doesn’t do real time translation of the web page (at least I couldn’t figure out how). For that I use a plug in.