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Moved other buttons #18
Have done some testing on this, and I think it just comes down to how each extension (or the browser) positions its buttons on application startup. It can be a messy system, and sometimes they just don't always play nicely with each other. I especially noticed this with some restartless add-on buttons.
Fortunately, If you do see this happen after installing Reader View, it should only be a one-time event. You will have to rearrange your UI once before it sticks, and it should stay that way... assuming other extensions don't mess with it later.
Once installed, the add-on sets a preference in about:config to remind itself to not to not add the button to the UI again. This preference stays in your browser's config even if you uninstall the extension (as a side effect of how Firefox and derivative browsers handle extension preferences). So as long as you do not delete or reset that preference manually, you should not see your UI change again, even if you uninstall and reinstall later.
HTH. I've commited 051aa3b to reintroduce this functionality, and it should be a bit more stable now. I'll do some more testing and will probably release 1.0.2 tomorrow.