Like the title says. I only use Tabliss, Dark Reader and uBlock Origin. These never gave me problems until recently when I updated Firefox Portable to 92.0.1 or somesuch, and, updating to 93 after that didn't make the problem go away. If I close Firefox Portable and open again right away, the addons load normally. The issue could be related to Sandboxie-Plus, as it always occurs after I emptied the sandbox, but it also happens sometimes (sometimes frequently) if I run Firefox Portable unsandboxed. Previously I had already tried a freshly unpacked Firefox Portable by downloading and installing the FirefoxPortable_92.0.1_English.paf.exe file a few weeks ago (on Windows 10) to see if that helped, but this also hadn't made the problem go away. (I upgraded the OS to Windows 11 since then, and, seems the upgrade was completed just fine, I haven't experienced any troubles with it so far.)
I have run out of ideas to further continue to troubleshoot Firefox Portable so, please help, thanks.
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The problem was indeed caused by Sandboxie-Plus. I had added a folder to the "Forced folders" list in the sandbox settings, and, inside this folder, I had created an NTFS junction that pointed to my FirefoxPortable folder. After I deleted this junction and replaced it with an actual copy of my FirefoxPortable folder, the problem went away.