How I view links from Librem Social (Tusky fork) at present:
1. Press the three little dots in the bottom-right corner of the post containing the link.
2. Select "Copy the link".
3. Press the square Android button to get the list of open windows.
4. Find Lightning and press on it.
5. Press the three dots in the top-right corner.
6. Select "New incognito tab".
7. Press on the URL bar.
8. Press the backspace button on the on-screen keyboard to delete "about:blank".
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