You are misinterpreting the information here. Neither Firefox nor Ubuntu are doing anything to your root directory. The behavior described and what you are undoing is that your storage device is being made available at two locations: both at / and at the hunspell path.
Unfortunately, you'll probably have a hard time finding a new Bolt at this point. They've just stopped making them and dealerships haven't really been able to keep any in stock for months in my neck of the woods. Apparently they will eventually come back but the timeline hasn't been announced so probably several years.
Ballots aren't signed, but the envelopes the ballots are in are.
This is just not true. Regenerative braking is much more efficient than that.
The signatures are checked in an initial step and then the ballots are removed from the signed envelope and grouped with other ballots before being counted - it's about as anonymous as in person voting.
Here's an article to read about the history in Colorado, one of the early states to implement it: https://www.coloradoan.com/story/news/2020/10/01/colorado-mail-in-ballot-absentee-voting-how-state-perfected-system/3572176001/
There is a state law in Texas and many other states.