This is a tool by @pellaeon [https://github.com/pellaeon], a BIT modyfied by me and with a new installation guide.
Link to the Original: https://github.com/pellaeon/firefox-91plus-photon-userchrome
In fact, I only have change the size of the single tabs on the top corner. Mainly, I created this project, that I can find this stuff easily and to create a installation guide.
The main work (99.9 %) is made by pellaeon!
Guide for the Firefox-Photon-Clone of pellaeon (and Kosmoi)
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Download the repository and unpack it.
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Open the 'about:config' site in firefox and set the 'toolkit.legacyUserProfileCustomizations.stylesheets' preference to 'true'
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Open the 'about:support' site and the 'Profile Directory' folder, which is declared in the Table in the 'about:sopport' page.
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Copy the 'chrome' folder of the repository in the 'Profile Directory' folder
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Click on the 'Clear startup chache' button in the box at the top right corner in the about:support and restart the firefox browser.