Yes, Bookmarks are safe. Bookmark files are just simple html.
2,4 Why are browser extensions not suggested for Tor Browser? a. Because you want to fit in with all other Tor users. You want to be as anonymous as possible. If a website sees that your browser configuration is slightly different than other users because of a browser extension, the that's a way ...
You need to do some steps to get Privoxy working with Tor and Safari.
Open the Privoxy config file and search for 9050. You'll find the line: # forward-socks5 / 127.0.0.1:9050 .. Remove the # at the beginning of the line. If you're using Tor Browser, Tor listens on port 9150, so change the 9050 to 9150. If you have installed a system-...
See, there is such options in config file of Tor, /etc/tor/torrc:
You could find the same in your torrc, uncomment it and launch your browser with "Proxy settings", proxy type: socks5, address: 127.0.0.1, port 9050.
Tor Browser can run alongside any number of other browsers, but by default your other browsers will not be run through the Tor network. Many users have Tor Browser for private browsing whilst keeping other browsing for less sensitive use.