There are two methods to transfer the VSCode extensions of one computer to another:
Using Settings Sync extension
The extension is very powerful but its usage is not easy for newbies.
Using the VSCode builtin commands
On computer A:
➜ ~ code --list-extensions --show-versions | xargs -L 1 echo code --install-extension
code --install-extension albymor.increment-selection@0.2.0
code --install-extension pepri.subtitles-editor@1.1.6
...
Copy and paste the above echo output to machine B.
Press enter, the installation process begins:
Installing extensions...
Note: --show-versions is to clamp the version, so that the two computers have identical extensions installed.
Note: In the same way, follow the command below to uninstall all extensions.
➜ ~ code --list-extensions | xargs -L 1 echo code --uninstall-extension
If you are not familiar with code or xargs commands, just use code -h or man xargs to figure out.