Looks like a Eureka that has had a very hard life; and may have some twig bore problems as well as a serious lack of fertilizer. Personally, I would not try to save it, as it will likely never be a good tree. Unless you just happen to love Eurekas, or you have some emotional attachment to this tree, I would take it out and replace it with a Meyer on Carrizo or other non-dwarfing rootstock, if you can find one.

Here is a link to Firefox and pages not loading properly. One of the many possible problems cited may be the add-ons and plug-ins but suggest you take the steps from the top. In your statement of your problem: 1-Error includes the word "chrome" and if that is Google's Chrome you might consider taking care of Chrome at least temporarily. (I avoid using Chrome because I am somewhat paranoid when it comes to Google and accusations of misuse of its data collection.) As to slowness of browsers, you might also look to make sure you do not have too many programs loading when you boot your computer. Here is a link that might be useful: Firefox - pages not loading properly

I cannot dismiss early stage gummosis by looking at the picture above. I think a local expert should look at the tree. If this appeared on my roses I would say it is the work of a sawfly but on citrus? In the meantime I would isolate the tree if potted, treat the wounds and the soil with copper and if more of it appeared I would cut off the affected canes making sure the wood exposed looks nice and healthy. To investigate further ones needs to look at the state of the foot below the soil so a little digging may be in order. The fungal disease called 'Citrus gummosis' starts at the root and foot but there are also other types of gummosis. Also take a look at this, paying attention to 'citrus gummosis' and 'Rio Grande gummosis' https://cals.arizona.edu/extension/ornamentalhort/plantprotect/citrusdisease.pdf

where are you .. what was winter like .... did you have a soil test ... how did you plant it ... how can your neighbors be 5 feet away.. when the last pic makes it look like your tree is more than 5 feet from the fences .... based on your lawn ..... how do you water it ... what is your base soil.... how does it drain ... in the first pic ... i cant really tell .. but is/are these all old leaves... what does new spring growth.. if any .. look??? and do understand ... even with evergreen plants.. they shed leaves .. both cyclically ... and in reaction to stress ... and in the process of shedding.. they usually look bad ... but that is not a reason to presume an ongoing disease process ... its no different than late fall with any deciduous trees ... sooooo .. the stress of planting less than a year ago ... and perhaps a winter that might have been a little colder than the plant likes.. could be the reason for this shedding ... btw .. you dont mention how big the neighbors tree is .... with trees.. we talk about tree time ... which is counted in decades .. so one year from planting is not all that long ... so many questions.. so little time ... ken ps: this MI boy has no direct citrus experience.. so if this is some self evident citrus problem.. forgive me for just tutoring you on trees ...