Interface malfunctions with v18 update

After updating to v18, I have the following interface problems:

1. Ctrl+Shift+T no longer re-opens closed tabs

2. When I open a new window (startup or ctrl+n), the top bar looks like this (, but it's supposed to look like this ( I can temporarily fix this for each window by showing the menu bar and then hiding it again (I usually keep it hidden).

3. All "Add To Firefox" buttons (themes, add-ons, etc) do nothing when I click them.

4. I can't toggle "Tabs on Top." It's stuck on the checked state.

5. When I switch from one tab to another, the old tab's url is in the new tab's navigation bar. For example, if I close, it will still say "" in the navigation bar even though I'm looking at the firefox site.

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