This userscript allows the user to set the toolbar in a "toggle" mode: always masked, and displayed when the mouse is moved over the top of the tab's viewport. Margins and padding are restored to the original values when the toolbar is put in this mode.
As a safeguard in case this script breaks a page (it shouldn't), the "toggle" mode is only activated when double-clicking an empty space in the toolbar (whitespace either on the right or on the left between the logo and the capture infos).
Moving the mouse at the top of the page's viewport should display the toolbar. If it doesn't, it means that an element of the page, usually the header or a fixed element, is in front of the toolbar. Maintain both
alt keys down while moving the mouse (at the top). When the toolbar reappears, release the keys. It stays visible as long as the mouse is over it.
New in version 0.6.1 (2020-05-06): Once the toolbar is in "toggle" mode, you can click its "close" icon - if it is green - and the toolbar will disappear until you use the "
alt" trick. If the button is gray it means that the userscript won't be able to respawn it.
For more userscripts, styles, extensions, tips, ..., visit my programming page.