Last week I installed Tor. Prior to that I had Mozilla Firefox as my main browser.
Many of the issues that I'd been told to expect with Tor did not appear. Browsing wasn't slower, it might even have been faster. Several websites did not "like" Tor, which is not the fault of Tor, but of bias or the occasional bad person who might have used Tor (one forum I like to visit refused to let me login as a previous Tor user had to be banned, and they use IP tracking for banning, so...) I would reconsider using such sites, even Google (there are other, Tor-friendly search engines out there), although there is at least one non-Tor-friendly site I have
Somehow Firefox stopped working. Every time I tried to use it I got an error message (the one that says there is no network connection). Following a friendly Tor user's advice (a computer programmer I know) about modifying Firefox did not fix the problem, and I couldn't find any advice about this online, probably because no one else was suffering from the same issue. This shouldn't have been an issue since I could just never use Firefox again.
Unfortunately I'm a book addict and have to be able to access Overdrive, a public library "server" that lets you borrow ebooks the way you could physical books. Using Tor, I could actually download the ACSM file, a tiny 1.7 KB "pointer file", but Adobe Digital Editions utterly refused to download the actual EPUB due to an "access error". That used to happen on occasion before installing Tor, but now it happened literally every time. The vast majority of those library books are EPUBs, not PDFs, so I couldn't avoid this issue. Adobe Digital Editions does not
use the browser, so Firefox not working shouldn't even have been relevant. Restarting the computer several times did not help. It seems Tor did something to my network settings, allowing Tor and my anti-virus upgrade to work, but nothing else.
After a week I downloaded a "fresh" copy of Firefox, made an RAR copy of Tor and then deleted the original installation. I'm keeping the RAR copy because I hope to install Tor at some point. It was easy to copy bookmarks to and from Tor regardless, so getting back to Tor would be easy if I could figure out what the technical problem was. Oddly enough, when I reinstalled Firefox it brought me back the few extensions I use (such as AdBlock and Noscript), stored email addresses, etc. It seems either Firefox is very persistent, or Windows does not uninstall programs properly.
As soon as I restarted the computer, Firefox started working, and I was able to download the EPUBs. The problem immediately vanished.