Files does have a search facility - you just start typing or press <Ctrl>F and type into the pathbar (which doubles as search entry). The first results returned are those found in the current directory. It also returns (grouped separately) results found in subfolders of the current folder, in bookmarks and in recently used.
However, if you wish you ...
The "New" list in the right-click menu draws from XDG_TEMPLATES_DIR in .config/user-dirs.dirs.
Running the command tail ~/.config/user-dirs.dirs showed that XDG_TEMPLATES_DIR was set as $HOME and hence was trying to use all the various dotfiles in the home directory as templates.
Amending the file so it says XDG_TEMPLATES_DIR="$HOME/Templates" followed by ...
Alternatively you can also simply install it via Flatpak just by clicking on the "Install" button in the Flathub page for Firefox: https://flathub.org/apps/details/org.mozilla.firefox
This flatpak package is directly maintained by Mozilla.
There are a number of outstanding issues reported against Files in relation to file operations involving very large number of files. Files is currently best used for small to modest amounts or data (<10K items?). A crash might be caused by a memory leak for example. One of the proposals for this year's GSOC is the improvement of the aspect of Files.
The password is stored in your login keyring.
The easiest way to find it is with GNOME Seahorse.
Install Seahorse from AppCenter.
Open the application from AppCenter or open the Passwords and Keys application from the Applications Menu.
Click the Login bookmark on the left under Passwords.
Find your login which should be marked as a Network password.
It appears Files is showing the partition unique GUID.
If you label the volume you're mounting, Files should show that instead.
The method to do this varies depending on the filesystem of the volume.
GParted and GNOME Disks offer great graphical interfaces for changing labels.
Both applications are available in AppCenter.
Labels can also be changed via the ...
I do not think it is possible to enforce one custom date-time format on every thing unfortunately. If you search for "format" with dconf-editor you will find 8 or 9 different settings for different apps that control date and/or time format they use and most of those do not provide for an arbitrary custom format. For example for the wingpanel the time can be ...