This is the same issue that I reported about a month ago with the nightly's. The only thing I could do was to uninstall Adguard and reinstall. But the WPS filter caused extremely slow browsing. The only way I could fix it was to completely uninstall Adguard and install the Adguard browser extension for Firefox. Everything is fine using just the extension. Good luck.I can't enable nightly channel, I just can't use anything from the AdGuard user window and settings. I sent a message to technical support to see what solution they give me unless I have to uninstall and reinstall the program.