I have more bookmarks in the bookmarks toolbar than Firefox is able to display which leads to the unfortunate situation that the last ones are not shown in the toolbar anymore. While it is still possible to access the bookmarks using left and right arrows once, it is not an ideal situation and needed to be fixed.
The first thing that came to mind was to change the text of the bookmarks so that they would not take up that much space on the toolbar anymore. The idea made sense but you will eventually run into issues again as space is limited on the bookmarks toolbar.
I knew that Firefox was highly customizable and I began searching for a way to alter the style of the bookmarks toolbar and quickly found it. Now, to change the style, which includes reducing or increasing font sizes, changing the font type, changing colors on that font and much more you need to open userchrome.css which should be in your Firefox profile folder.
To find your Firefox profile folder enter about:support into the Firefox address bar and click on the show folder link on the page that opens up.
Paste the following line of code at the end of this file:
font-size: 9px !important;
This changes the default font size to 9px which is what I'm currently using. To increase it just increase the value. Some other settings that you can try:
Update: Some users have asked me where they can find the Firefox profile folder. The easiest way to locate it is to click on the Firefox button, and select Help > Troubleshooting Information from the context menu there.
Here you find the profile folder listed under Application Basic. Just click on the button to be taken there directly.
Update: There is another option that you have. Check out our guide on making the most out of Chrome's and Firefox's bookmarks bar. The idea here is to rely solely on icons and no text at all to make use of the space in an optimal fashion.
Another option that you have is to use bookmark folders to sort bookmarks into.
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