Update README.md

README.md

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-**Moon Tester Tool** is designed for testing compatibility of add-ons with **Pale Moon**. It allows to install any extension, regardless of target application and versions specified in its manifest. The extensions installed via **Moon Tester Tool** are marked with **[TEST]** at the beginning of the name and can't be updated automatically.
+**Moon Tester Tool** is designed for testing compatibility of add-ons with **Pale Moon** and autocorrect doubled text in Firefox themes. It allows to install any extension or theme, regardless of target application and versions specified in its manifest. The extensions installed via **Moon Tester Tool** are marked with **[TEST]** (or **[FIX]** for themes) at the beginning of the name and can't be updated automatically.
 
 ##### Warning! Moon Tester Tool is intended for advanced users and for test purposes only!
 
-Installation of improper extensions may break the browser and lead to the damage or loss of data. You can't expect or ask for any support of extensions installed via **Moon Tester Tool** neither from authors of add-ons, nor from developers of the browser. 
+Installation of improper extensions or themes may break the browser and lead to the damage or loss of data. You can't expect or ask for any support of extensions and themes installed via **Moon Tester Tool** neither from its authors, nor from developers of the browser. 
 
-If you find the extension that runs well, you have to contact author and ask him provide compatibility with **Pale Moon** officially.
+If you find the extension or theme that runs well, you have to contact author and ask him provide compatibility with **Pale Moon** officially.