Total Virus result
for FirefoxPortable_77.0.1_English.paf.exe:
https://www.virustotal.com/gui/file/cf55b6fc9cfffdd36d236a428e9118e90cb4...
for FirefoxPortable_76.0.1_English.paf.exe:
https://www.virustotal.com/gui/file/98bae072f2b0e7c4e0f90a005db6a993d0fd...
for GoogleChromePortable_83.0.4103.97_online.paf.exe:
https://www.virustotal.com/gui/file/ff324ea27091c70f459454494a60f9e87952...
Are they realy trojans or just false positives?
These are false positives. True positives will show detections in dozens of engines. See here: https://portableapps.com/support/antivirus