DB Error

Chrome

• Find your Chrome profile folder - type in chrome://version/ in Chrome, then look at "Profile Path".
• Browse to this path with your OS's file browser.
• Open the "IndexedDB" folder, then the "chrome-extension_hncgkmhphmncjohllpoleelnibpmccpj_0.indexeddb.leveldb" and the "chrome-extension_hncgkmhphmncjohllpoleelnibpmccpj_0.indexeddb.blob" folder. The databases will be in this folder.
• Close Chrome.
• Check to make sure the files and directories are writable. The steps to do so depends on your OS, but generally involves right-clicking on the file and choosing "Properties". If the file is read-only, set it to read-write and start Chrome.
• If the files and directories were already writable, but you still have problems, you can delete them (after backing it up if you wish). But you will lose any previously installed styles.

Firefox

Make sure you are not in Private mode, If you want to using xStyle in Private mode, check the following method

• Open about:debugging, find the Internal UUID of xStyle (e.g. d52e1cf2-22e5-448d-a882-e68f3211fa76).
• Find your Firefox profile folder - type in about:support in Firefox, then look at "Profile Folder", Click "Open Floder".
• Close Firefox.
• Open the storage/default/moz-extension+++{Internal UUID} folder (the {Internal UUID} is the Internal UUID of xStyle you found in step one). The databases will be in this folder.
• Check to make sure the files and directories are writable. The steps to do so depends on your OS, but generally involves right-clicking on the file and choosing "Properties". If the file is read-only, set it to read-write and start Chrome.
• If the files and directories were already writable, but you still have problems, you can delete them (after backing it up if you wish). But you will lose any previously installed styles.

Using xStyle in Firefox's Private Mode

I'm not sure that the following method will work well. But you can try it.

Add an exception for xStyle:

• Open about:debugging, find the Internal UUID of xStyle (e.g. d52e1cf2-22e5-448d-a882-e68f3211fa76).
• Open Firefox options.
• Go to Privacy & Security.
• Set History mode to "Use custom settings".
• Click "Exceptions".
• Paste our URL: moz-extension://{Internal UUID}/ (the {Internal UUID} is the Internal UUID of xStyle you found in step one), for example, moz-extension://d52e1cf2-22e5-448d-a882-e68f3211fa76/, Then click 'Allow'.
• Click "Save Changes".